Polish fixed rotated recents animation

For the cases that move recents or home to top, the transformed
state is kept until the transition of task-to-front is done.

This fixes the flickering when switching between recents and the
activity that supported PiP. Also eliminated an additional toggle
of fixed rotation transform from finishing recents animation.

Fixes: 154588225
Test: atest RecentsAnimationControllerTest

Change-Id: I92c6dfac1d030f76f62a10bd0596f935adffb63c