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". It's confusing when displaying the badge is enabled but it is not shown on the list consistently.

There is also a thread an meta.discourse.org: https://meta.discourse.org/t/22245