Fix TV PiP back and forth animation after switch

When switching from one PiP to another, the new PiP was briefly starting
to animate to the size of the previous PiP before going back to the new
size.

Bug: 264362433
Test: manual - launch a vertical PiP and then start a horizontal PiP on
top of it (orientation change only to make issue more visible if it
happens)

Change-Id: Ic954444756b245cfd44c1f2b97ada668fc6ace83