Update alternate bouncer scrim values

Even when QS isn't clipped, the behind
alpha should be 1f for AUTH_SCRIMMED_SHADE.

Test: pull down notification shade on LS, then
tap a notification with intent => see alternate
bouncer with the correct scrim values
Test: on the LS, double tap the power button
to open the camera app. Pull down the shade and
then tap on a notification with intent => see alternate
bouncer with the correct scrim values
Test: atest ScrimControllerTest
Bug: 237362467
Change-Id: Ib68d8c9d0bb16a486b9940ba103cb10c6587872b

Change-Id: Id07fd3294a1dc807febe1ef04fc033def56fe30f