fix(cli): clear highlighter highlights before reloading the colorscheme

Old highlights were remembered and that led to unexpected behaviour with, for example, Telescope, when toggling transparency. The highlight groups set for Telescope are very different in transparent mode vs non-transparent mode.

lua/mellifluous/cli.lua

@@ -24,6 +24,7 @@ function M.create()
             return
         end
 
+        require("mellifluous.utils.highlighter").clear_highlights()
         vim.cmd("colorscheme mellifluous")
     end, {
         nargs = 1,

lua/mellifluous/utils/highlighter.lua

@@ -40,4 +40,8 @@ function M.apply_all()
     end
 end
 
+function M.clear_highlights()
+    highlights = {}
+end
+
 return M