fix(cooklang): apply correct filetype

`Cooklang` files are recognized as `cook` in vim. This prevents the parser
from attaching since it is looking for `cooklang` files, so we have to
specify the `filetype` here.

lua/nvim-treesitter/parsers.lua

@@ -288,6 +288,7 @@ list.cooklang = {
     files = { "src/parser.c", "src/scanner.c" },
   },
   maintainers = { "@addcninblue" },
+  filetype = "cook",
 }
 
 list.corn = {