Fix bouncer flickering on dream swipe up end

If the user swipes up on the dream to show the bouncer but releases
before the gestures has gone far or fast enough to show the bouncer,
the bouncer may flicker into view due to this reset call.

This reset call should not be needed as the BouncerSwipeTouchHandler
continues the gesture's motion after release to either fully expand or
hide the bouncer. Once the bouncer animates back to fully hidden,
PrimaryBouncerInteractor hides and dispatch state as needed.

Bug: 275600358
Test: atest BouncerSwipeTouchHandlerTest
(swipe then release is covered by existing unit tests)
Change-Id: Ieef85004c4ecf7e114204c83ae72438dbcf8bb88

Change-Id: I5849092c18393baf89ba0bb96de8a4b435daee55