Reset the pip icon overlay scale and offset

Make sure we properly reset the scale and offset
of the content overlay for PiP, as we reset the task scale
and set a new crop.

We also need to use different bounds to make overlay
calulations if in fixed rotation.

Test: swipe up to enter PiP with srcRectHint=null
Bug: 314010733

Change-Id: I38a465009497a60685f7bab73ddae2f389c4451f