Deprecates the animatingBounds from WM to SysUI

PipTouchHandler, similar to other components in SysUI, should be in-sync
with the destination bounds calculated within SysUI rather than WM.

Fixed also the empty movement bounds upon the first call to
PipTouchHandler#onMovementBoundsChanged. Together, this change should
fix the PIP not being lifted on IME show up. PipTouchHandlerTest is
updated correspondingly.

Bug: 153352899
Test: manually enter/exit PiP
Test: atest PipTouchHandlerTest
Change-Id: I2912af2a181b7fb57c6d90751744d46c6b3366d2