deffered plugin syntax highlight causes welcome screen to flash

[evanpurkhiser]

This line here https://github.com/eddyekofo94/gruvbox-flat.nvim/blob/756dbdd3dfd3ed84acb2f9649724df19ae41f904/lua/gruvbox/util.lua#L208

causes neovim to flash the welcome screen

https://user-images.githubusercontent.com/1421724/175831201-8b9288e7-10bc-4077-bdd3-e3c8d4de31e2.mov

Moving that line out from being deferred keeps it there

https://user-images.githubusercontent.com/1421724/175831237-7989e9db-7490-48f1-a24f-b9b8ce80dc67.mov

[evanpurkhiser]

Same issue as this probably https://github.com/folke/tokyonight.nvim/issues/130

[eddyekofo94]

Open a PR @evanpurkhiser ? I'll review it