[flexiglass] Fix split shade loading

Split shade is part of ShadeScene, but is LOCATION_QS for media layout purposes

Flag: com.android.systemui.scene_container
Fixes: 371604686
Test: manual on tablet - verify media appears on first load, in both landscape and portrait
Change-Id: If0afaacf0ae849621b1886420fa4a1c23aae8c3a
3 files changed