Don't apply animation clip to dialog activities

If launching a dialog activity from Recents app UI, the top region
of this dialog will be clipped. This is caused by applying clip rect
animation effect for Recents app scale up/down transition.

However, the clip rect animation is not needed for non-inset decor
app window, e.g. dialog activity.

https://code.google.com/p/android/issues/detail?id=161362
Bug: 20652683
Bug: 19523205

Change-Id: Ida8c3b28b3789061d6ebb662bc08738d7daec3a0