Fix TvPipMenuActionButton not found

TvPipMenuActionButton has recently been renamed to
TvWindowMenuActionButton. Changes to the TV PiP menu structure
partially reverted those changes.

Bug: 241744433
Bug: 243766829
Test: manual - starting a PiP on TV works again
Change-Id: I80a53bbeaee8a96b272a90ac60cc81dc6b146418