Do not set crop when removing pip

Actually the finishTransaction already contains the end state crop
which was set by wm.Transition#resetSurfaceTransform.

This also avoids setting unexpected crop to unrelated task if the
transition info contains other non pip task.

Bug: 340367710
Test: Dismiss pip and launch it again.
Change-Id: I110d1c11f3d3fdcfb83698e5cf1ec4efb062bd10