Help needed: advanced vim configuration

- [x] I have fzf 0.30.0 or above
- [x] I have read through https://github.com/junegunn/fzf.vim/blob/master/README.md
- [x] I have read through https://github.com/junegunn/fzf/blob/master/README-VIM.md
- [x] I have read through the manual page of fzf (`man fzf`)
- [x] I have searched through the existing issues

**Too stupid for customized RG Command in vim - help needed please.**

Hey guys, i am having trouble adapting an advanced vim command explained in your Readme file already and i cannot get it to run as i'd like to.

The following snippet is from my vimrc and it should introduce 2 shortcuts if `rg` is available as a bash command:
1. Cmd-F should open an interactive search window where i can enter a search term followed by an optional path e.g. `C-F foo app/` should open the interactive search window, i enter the phrase foo as a search keyword and want to limit the search results on the app directory
2. `K` should act the same as Cmd-F with the difference that it has already a search term prefilled (the full word under the cursor)

Everything works as expected except the limitation to the given directory. What am i doing wrong here?

```
if executable("rg")
function! RipgrepFzf(query, fullscreen)
let command_fmt = 'rg --column --line-number --no-heading --color=always --smart-case -- %s || true'
let initial_command = printf(command_fmt, shellescape(a:query))
let reload_command = printf(command_fmt, '{q}')
let spec = {'options': ['--phony', '--query', a:query, '--bind', 'change:reload:'.reload_command]}
call fzf#vim#grep(initial_command, 1, fzf#vim#with_preview(spec), a:fullscreen)
endfunction

command! -nargs=* -bang RG call RipgrepFzf(, 0)

noremap :RG
nnoremap K :RG
endif
```

Any help or suggestions are appreciated (even if it's only coding style due to me being new in vim and configuring it)