Virtualtext at the end of a line not showing as comment after colorscheme reload

## Information

**VIM version**
VIM - Vi IMproved 9.0 (2022 Jun 28, compiled Oct 01 2023 12:12:50)
Included patches: 1-1968

Operating System:
$ uname -r
6.5.5-arch1-1

## What went wrong
When the colorscheme gets reloaded, virtualtext loses its "comment" highlighting.

Clean vim loaded:

reload colorscheme

I was able to get around this partially by adding the following to the function that manually toggles `background` (and thus reloads the colorscheme):
```vim
function! s:TogBG()
let &background = ( &background == "dark"? "light" : "dark" )
highlight link ALEVirtualTextError Comment
highlight link ALEVirtualTextStyleError ALEVirtualTextError
highlight link ALEVirtualTextWarning Comment
highlight link ALEVirtualTextStyleWarning ALEVirtualTextWarning
highlight link ALEVirtualTextInfo ALEVirtualTextWarning
hi ALEError cterm=undercurl
hi ALEWarning cterm=undercurl
endfunction
```

However, this *doesn't* solve the problem when the colorscheme is reloaded automatically, for example, when my terminal background gets changed and vim follows that change.

I'm also suspicious that if these highlight groups get somehow reset, then other non-visible items may also silently reset.
In fact, I also have to add ALEError and ALEWarning `cterm=undercurl` in the manual function, too, because they get reset to underline.

## Reproducing the bug

* open vim
(if the terminal background is light)
* set background=dark
* or the other way around (if the background is dark, set it to light)

And the virtualtext at the end of the cursor is no longer italic and light (see figures above)

### :ALEInfo

Current Filetype: python
Available Linters: ['bandit', 'cspell', 'flake8', 'flakehell', 'jedils', 'mypy', 'prospector', 'pycln', 'pycodestyle', 'pydocstyle', 'pyflakes', ...]
Linter Aliases:
'jedils' -> ['jedi_language_server']
Enabled Linters: ['mypy', 'pyright', 'ruff']
Ignored Linters: []
Suggested Fixers:
'add_blank_lines_for_python_control_statements' - Add blank lines before control statements.
'autoflake' - Fix flake issues with autoflake.
'autoimport' - Fix import issues with autoimport.
'autopep8' - Fix PEP8 issues with autopep8.
'black' - Fix PEP8 issues with black.
'isort' - Sort Python imports with isort.
'pycln' - remove unused python import statements
'pyflyby' - Tidy Python imports with pyflyby.
'remove_trailing_lines' - Remove all blank lines at the end of a file.
'reorder-python-imports' - Sort Python imports with reorder-python-imports.
'ruff' - A python linter/fixer for Python written in Rust
'trim_whitespace' - Remove all trailing whitespace characters at the end of every line.
'yapf' - Fix Python files with yapf.

Linter Variables:
" Press Space to read :help for a setting
let g:ale_python_auto_pipenv = 0
let g:ale_python_auto_poetry = 0
let g:ale_python_auto_virtualenv = 0
let g:ale_python_mypy_auto_pipenv = 0
let g:ale_python_mypy_auto_poetry = 0
let g:ale_python_mypy_executable = 'mypy'
let g:ale_python_mypy_ignore_invalid_syntax = 0
let g:ale_python_mypy_options = ''
let g:ale_python_mypy_show_notes = 1
let g:ale_python_mypy_use_global = 0
let g:ale_python_pyright_auto_pipenv = 0
let g:ale_python_pyright_auto_poetry = 0
let g:ale_python_pyright_config = {}
let g:ale_python_pyright_executable = 'pyright-langserver'
let g:ale_python_pyright_use_global = 0
let g:ale_python_ruff_auto_pipenv = 0
let g:ale_python_ruff_auto_poetry = 0
let g:ale_python_ruff_change_directory = 1
let g:ale_python_ruff_executable = 'ruff'
let g:ale_python_ruff_options = ''
let g:ale_python_ruff_use_global = 0

Global Variables:
" Press Space to read :help for a setting
let g:ale_cache_executable_check_failures = v:null
let g:ale_change_sign_column_color = 0
let g:ale_command_wrapper = ''
let g:ale_completion_delay = 100
let g:ale_completion_enabled = 1
let g:ale_completion_max_suggestions = 50
let g:ale_disable_lsp = 'auto'
let g:ale_echo_cursor = 1
let g:ale_echo_msg_error_str = 'Error'
let g:ale_echo_msg_format = '[%linter%] %s [%severity%]'
let g:ale_echo_msg_info_str = 'Info'
let g:ale_echo_msg_warning_str = 'Warning'
let g:ale_enabled = 1
let g:ale_fix_on_save = 1
let g:ale_fixers = {}
let b:ale_fixers = ['black', 'ruff', 'isort']
let g:ale_history_enabled = 1
let g:ale_info_default_mode = 'preview'
let g:ale_history_log_output = 1
let g:ale_keep_list_window_open = 0
let g:ale_lint_delay = 200
let g:ale_lint_on_enter = 1
let g:ale_lint_on_filetype_changed = 1
let g:ale_lint_on_insert_leave = 1
let g:ale_lint_on_save = 1
let g:ale_lint_on_text_changed = 'normal'
let g:ale_linter_aliases = {}
let g:ale_linters = {}
let b:ale_linters = ['mypy', 'ruff', 'pyright']
let g:ale_linters_explicit = 0
let g:ale_linters_ignore = {}
let g:ale_list_vertical = 0
let g:ale_list_window_size = 10
let g:ale_loclist_msg_format = '[%linter%] %s [%severity%]'
let g:ale_max_buffer_history_size = 20
let g:ale_max_signs = -1
let g:ale_maximum_file_size = v:null
let g:ale_open_list = 0
let g:ale_pattern_options = v:null
let g:ale_pattern_options_enabled = v:null
let g:ale_root = {}
let g:ale_set_balloons = 0
let g:ale_set_highlights = 1
let g:ale_set_loclist = 1
let g:ale_set_quickfix = 0
let g:ale_set_signs = 1
let g:ale_sign_column_always = 0
let g:ale_sign_error = 'E'
let g:ale_sign_info = 'I'
let g:ale_sign_offset = 1000000
let g:ale_sign_style_error = 'E'
let g:ale_sign_style_warning = 'W'
let g:ale_sign_warning = 'W'
let g:ale_sign_highlight_linenrs = 0
let g:ale_type_map = {}
let g:ale_use_neovim_diagnostics_api = 0
let g:ale_use_global_executables = v:null
let g:ale_virtualtext_cursor = 'current'
let g:ale_warn_about_trailing_blank_lines = 1
let g:ale_warn_about_trailing_whitespace = 1