Fix media carousel view size for scene container

In some cases an incorrect size could get cached in
MediaHostStatesManager and used in later layouts, even after we have a
scene container size - this adds a check to use the scene container size when
getting the view state

Flag: com.android.systemui.scene_container
Fixes: 371602434
Fixes: 390688474
Test: manual - view carousel with multiple players while rotating
Change-Id: Icd3fa1cf65e74a159170769ad8ec912502214a1d