Bug: comment.nvim doesn't use the neovim commentstring var

```lua
local M = { 'numToStr/Comment.nvim', event = 'VeryLazy' }
function M.config()
	require('Comment').setup {
		ignore = '^$',
		padding = true,
		mappings = { basic = true, extra = false },
	}
end
return M
```

when I open any non-treesitter file, it gives me `[Comment.nvim] nil` on trying to comment anything despite the commentstring being set