override mason.nvim higlights with an autocmd temporarily

https://github.com/williamboman/mason.nvim/discussions/133

lua/plugins/configs/mason.lua

@@ -4,7 +4,14 @@ if not present then
   return
 end
 
+vim.api.nvim_create_augroup("_mason", { clear = true })
+vim.api.nvim_create_autocmd("Filetype", {
+  pattern = "mason.nvim",
+  callback = function()
     require("base46").load_highlight "mason"
+  end,
+  group = "_mason",
+})
 
 local options = {
   ensure_installed = { "lua-language-server" }, -- not an option from mason.nvim