Show blog as only active item in TopMenu

This disables the wiki item in topmenu when blog is active. Due to blog
binding to "unknown action", topmenu obviously confuses this and thinks
it's on main page. So all active items are reset before blog is set to
active.

Change-Id: I334666b2da654e47d37dd958be03ea997271d776
Merge "Show blog as only active item in TopMenu"