Remove zoom when changing brightness

Now that we zoom out not just the wallpaper, we should not zoom out when the brightness slider is visible

Also the animation we have right now is rather abrupt. I've changed the stiffness of the spring to low to make it more gentle.

Fixes: 402146162
Test: demo in the bug
Flag: com.android.systemui.spatial_model_app_pushback
Change-Id: I7c0cbfd5d1cae3898486a9bfa985680f8e5a22bc