refactor(treesitter): make it easier to override installed parsers

lua/lazyvim/plugins/treesitter.lua

@@ -3,9 +3,6 @@ return {
     "nvim-treesitter/nvim-treesitter",
     build = ":TSUpdate",
     event = "BufReadPost",
-    config = function()
-      require("nvim-treesitter.configs").setup({
-        sync_install = false,
     ensure_installed = {
       "bash",
       "help",
@@ -23,6 +20,10 @@ return {
       "vim",
       "yaml",
     },
+    config = function(plugin)
+      require("nvim-treesitter.configs").setup({
+        sync_install = false,
+        ensure_installed = plugin.ensure_installed,
         highlight = { enable = true },
         indent = { enable = true },
         context_commentstring = { enable = true, enable_autocmd = false },