Fix expanding PiP on TV

When expanding PiP call PipTaskOrganizer.dismissPip() instead of
PipTaskOrganizer.scheduleAnimateResizePip() directly passing null
destination rect (which is causing a crash, while the dismissPip()
retrieves previously saved initial window's bounds and resizes back to
them).

Bug: 153776392
Bug: 153050065
Test: manual
Change-Id: Ieb9eacb3974b586f93732de35beb7edd9833db03