Removed titleColSpan of uncategorized topics

This behaviour is not consistent any more. We can toggle "suppress
uncategorized badge" in the admin page which has this description:
"Don't show the badge for uncategorized topics in topic lists."

So I think the intended behaviour is "show the category", or "don't show
the category". Not showing the badge on pinned topics is quite confusing
when it's explicitly enabled in the admin settings.

There is also a thread an meta.discourse.org:
https://meta.discourse.org/t/22245