[vim] Comment out the recently_used comparator

This comparator has a bug in it that was causing a syntax error after updating
neovim. Temporarily commenting this out until that bug is fixed.

config/nvim/lua/lsp.lua

@@ -30,7 +30,7 @@ cmp.setup {
         comparators = {
             cmp.config.compare.offset,
             cmp.config.compare.exact,
-            cmp.config.compare.recently_used,
+            -- cmp.config.compare.recently_used,
             clangd_extensions.cmp_scores,
             cmp.config.compare.kind,
             cmp.config.compare.sort_text,