vim:aucmd: Clear highlights on exiting visual mode

When exiting visual mode I want to clear the highlights of the visual
selection. As this is done automatically now, <Esc> does not need to do
it (and i had problems with keys.vim executing ClearHighlights because
of the script variables).

This reverts commit b3f1a469db ("vim:keys: Clear highlights on
normal-mode Esc").

.config/vim/vimrc.d/40-keys.vim

@@ -1,7 +1,7 @@
 " vim: set foldmethod=marker:
 " Keybindings """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
-" Clear all kinds of highlights when pressing Escape in normal mode
-nnoremap <silent> <Esc> :nohlsearch <bar> call ClearHighlights()<CR><Esc>
+" Clear search result highlights when pressing Escape in normal mode
+nnoremap <silent> <Esc> :nohlsearch<CR><Esc>
 
 " Indentation jump
 " https://vim.fandom.com/wiki/Move_to_next/previous_line_with_same_indentation