Umlauts/UTF-8 causes wrong error column to be shown

## Information

**VIM version**

```
VIM - Vi IMproved 8.2 (2019 Dec 12, compiled Oct 7 2020 19:37:01)
macOS version
```

Operating System: MacOS

## What went wrong

Umlauts (åäö) / UTF-8 causes wrong error column to be shown visually.

## Reproducing the bug

Write a line containing umlauts/UTF-8 and a syntax error. Lint with `clj-kondo`, which displays character, not byte, column. Observe error column being shown left from the correct position.

### :ALEInfo

```
Current Filetype: clojure
Available Linters: ['clj-kondo', 'joker']
Enabled Linters: ['clj-kondo']
Ignored Linters: []
Suggested Fixers:
'remove_trailing_lines' - Remove all blank lines at the end of a file.
'trim_whitespace' - Remove all trailing whitespace characters at the end of every line.
Linter Variables:

Global Variables:

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 = v:null
let g:ale_completion_enabled = 0
let g:ale_completion_max_suggestions = v:null
let g:ale_disable_lsp = 0
let g:ale_echo_cursor = 1
let g:ale_echo_msg_error_str = 'Error'
let g:ale_echo_msg_format = '%code: %%s'
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 = 0
let g:ale_fixers = {}
let g:ale_history_enabled = 1
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 = {'clojure': ['clj-kondo']}
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 = '%code: %%s'
let g:ale_lsp_root = {}
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_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 = '>>'
let g:ale_sign_info = '--'
let g:ale_sign_offset = 1000000
let g:ale_sign_style_error = '>>'
let g:ale_sign_style_warning = '--'
let g:ale_sign_warning = '--'
let g:ale_sign_highlight_linenrs = 0
let g:ale_statusline_format = v:null
let g:ale_type_map = {}
let g:ale_use_global_executables = v:null
let g:ale_virtualtext_cursor = 0
let g:ale_warn_about_trailing_blank_lines = 1
let g:ale_warn_about_trailing_whitespace = 1
Command History:

(finished - exit code 3) ['/bin/bash', '-c', 'clj-kondo --cache --lint ''/var/folders/tl/9_nnmfjs0lj4g924c1qwxdjh0000gp/T/vPEjYtY/22/xxx.clj''']

<<>>
/var/folders/tl/9_nnmfjs0lj4g924c1qwxdjh0000gp/T/vPEjYtY/22/xxx.clj:15:80: error: unresolved symbol data
linting took 20ms, errors: 1, warnings: 0
<<>>
```