Don't animate depth when changing brightness

On S, the wallpaper is zoomed out when the shade is down, we do not have
to do anything specific to the brightness mirror anymore.

Fixes: 186010374
Test: manual
Test: atest NotificationShadeDepthControllerTest
Change-Id: I9347708026045b7833aa51a9cfbb9ad2e6ee4321
3 files changed