FIX: Display top posts from private categories if the user has access. (PR #14878)

Users viewing the top topics from the categories page should see those belonging to a private category if they have access to it.


@eviltrout Git says you wrote this code four years ago. Do you remember why you used nil instead of current_user by chance?

Can confirm this is a bug because current_user is passed to the TopicQuery when fetching top topics in the ccategories#index method.

I’m not sure why I did that. This seems good.