neovim: Simplify cd command

augroup shouldn't be needed since this command is only ran once anyway.

modules/neovim/default.nix

@@ -60,10 +60,7 @@ in {
 
           autocmd BufNewFile,BufRead *.ecr    setlocal syntax=html
           autocmd BufWritePre,FileWritePre * silent! call mkdir(expand('<afile>:p:h'), 'p')
-          augroup cdgit
-            autocmd!
-            autocmd VimEnter * silent! :cd `git rev-parse --show-toplevel`
-          augroup END
+          autocmd VimEnter * silent! :cd `git rev-parse --show-toplevel`
         '';
         plugins = with pkgs.vimPlugins; [
           {