Remove user underline

Made a new little feature file that removes the underline from the user's name in the current post, but puts it back on hover, so it looks like a link.

I can see the reason they did that - usernames at the end of a post aren't underlined, so they shouldn't be expected to be links, usernames at the top of a post ARE underlines, so they should be expected to be links.

But I still kinda don't like it. :P