Fix for solid blue screen if CircularRevealActivity is not finished

If the ActivityManager doesn't finish and destroy
CircularRevealActivity automatically it can trigger onNewIntent on
the activity instead of onCreate the next time a call is started.
Make sure to handle that case as well.

Bug: 19428365
Change-Id: If051ebd449a7deddfdc60ae856e9e1a0f3cda77d