Stop animating wallpaper and non-app windows in WM

When keyguard is going away, WM applies animation on the wallpaper and
non-app windows. With remote animation enabled, all animation will be
handled in KeyguardService, so WM shouldn't apply animation locally.

Bug: 175686682
Test: Manual. Tap notification on the lock screen to dismiss keyguard,
      verify alpha value of the wallpaper surface unchanged.
Change-Id: I46879ef872cfa38e99586cbeb4c991d1ec359e87