Make QS pull down consistent with shade

QS pull down was not being eased like the shade, or all apps drawer.
Now it's using the same interpolator.

Test: manually pull down QS from the top of the screen
Test: atest NotificationShadeDepthControllerTest
Test: atest ScrimControllerTest
Fixes: 196662148
Change-Id: I44387c6295d10633ebffa02b0e45c0144dd8ddfe