fix: don't clear other autocmds when changing colorscheme

[thebengeu]

Currently, when changing colorscheme, all autocmds are cleared, so no new indicators appear when the cursor is moved.

The augroup is already created with {:clear true} before calling enable-highlights: https://github.com/jinh0/eyeliner.nvim/blob/c540d58bf52aa979d4cca639c60387ae0c0ccf88/fnl/eyeliner/main.fnl#L17, so there doesn't seem to be a need to clear again and then recreate the ColorScheme autocmd every time the colorscheme is changed.