Dismiss dream when swipe up detected and keyguard unlocked

Previously we were ignoring the gesture and instead letting the dream
handle it. However, for interactive dreams, a swipe-up won't cause the
framework to dismiss the dream. This ensures that dreams are dismissed
if we detect the user is swiping up in the bottom area of the dream.

Fixes: 298716569
Test: atest BouncerSwipeTouchHandlerTest
Flag: NA
Change-Id: Iaa45af8ccd6832736925a2d90f894d672a1d6f6b