Bug: Redirect on Rename

[JeremyCaney]

After renaming a topic in the Topic Editor, the page should redirect to the new name. Instead, it stays on the original key. This works for the initial load, since the CurrentTopic was set prior to the rename, but it will fail if the user refreshes or submits another update. There is already a similar redirect in place when deleting a topic, but apparently not when renaming a topic. This will also need to be IsModal aware so that these redirects take place in the context of nested topics as well.

[JeremyCaney]

This was addressed by simply redirecting all traffic after a successful Save(), which addresses both the existing IsNew logic and the errant rename logic of concern here, while additionally helping prevent accidental form resubmissions on refresh (2d16e25).