Fix to recognize FINISHING state as paused completed

Before, when ActivityRecord#addToFinishingAndWaitForIdle() triggered
resuming of activities, it would not succeeed because the state was
first set to FINISHING. Now, it is able to resume the top activities
correctly.

Fix: 148655903
Test: atest WmTests:RootWindowContainerTests#testAllPausedActivitiesComplete
Test: manual test that the login using Google can be finished correctly
Change-Id: Id62023761a4b99f923f4f95ec8eb0a9c0f1feed7