Fix split_shade_status_bar height to avoid layout on each animation

frame

This happens because MotionLayout with height==WRAP_CONTENT updates it's
height when transitioning from one state to another. Given the fact that
below content assumes the final height of the split_shade_status_bar
being around 120dp brightness slider accordingly

Test: manual on foldable. Verified screenshots before and after
Test: atest NotificationsQSContainerControllerTest
Fixes: 267125811
Change-Id: I1332f4c0115366afdafdd0eb17e01153216d253c