Remove treesitter prefer_git option (nvim-lua#1061)

- It's not safe and can corrupt other git repos
- nvim-treesiter maintainers consider `prefer_git` as deprecated and no
  longer needed.

See nvim-treesitter PR for details: nvim-treesitter/nvim-treesitter#6959

init.lua

@@ -1532,8 +1532,6 @@ require('lazy').setup({
     config = function(_, opts)
       -- [[ Configure Treesitter ]] See `:help nvim-treesitter`
 
-      -- Prefer git instead of curl in order to improve connectivity in some environments
-      require('nvim-treesitter.install').prefer_git = true
       ---@diagnostic disable-next-line: missing-fields
       require('nvim-treesitter.configs').setup(opts)