Unpin covering tests

Today there is a "pin covering tests" and "remove all pinned tests" but I miss a "unpin covering tests". This would be useful in "run only pined tests automatically" mode to unpin covering tests as you navigate your way in the source code.

Yes - this does appear to be missing from the hotkey options and it was supposed to be there. Thanks for pointing this out, I'll note it down for a fix.