Allow swipe up on unlocked dream.

This change allows users to swipe up on a dream to dismiss when
the lock screen can be dismissed without further authentication.

Fixes: 227333766
Test: atest BouncerlessScrimControllerTest
Test: atest ScrimManagerTest
Test: atest BouncerSwipeTouchHandlerTest
Change-Id: Ia3d6df9459989f003fad444ff08148666cefc042