Temporarily disable consecutive visibility assertion of close pip

There is no visual problem. Maybe the test should exclude the
condition if the invisible reason is because the requested
position is outside screen.

This fixes missing shadow of PiP task because the default
finish transaction resets most surface attributes according to
Transition#buildFinishTransaction.

Bug: 270678766
Test: ClosePipBySwipingDownTest
Change-Id: I76ddbf094d77a5e88a9203b9a54a16bc6a9b3fc6