Fix missing taskbar scrim in folded state when swiping up from immersive mode

TaskbarTransitions is needed for gesture nav too

Also updated the TaskbarTransitions check so that foldables are included (instead of just phones with the unification for phones flag on

Fixes: 353620747
Test: Scrim shows in Youtube immerisve mode
Flag: EXEMPT bugfix
Change-Id: I9990ef8f793e28b3af2f42b0a5a117fdfbdd4081