Add sorting by likes to the the Wishlist category

In the Meta for the software running this (meta.discourse.org), they have a Features button - and when you enter it, you can sort by Likes - see https://meta.discourse.org/c/feature?order=op_likes&status=open.

I think there’s some suggested code on how to do this at https://meta.discourse.org/t/sort-filter-by-likes/26193/1

Right now feature requests are directed here rather than Github, but the lack of sorting by clear voting on features is a weakness of the forum.

I realize that I can do this with the query string right now, but most people don’t want to go through that hassle.