Show footer when QS are expanded in Dual Shade

We were animating the footer out when QS are expanded, which was making
it flicker on the screen in dual shade. This change ensures we only hide
the footer in single shade when QS are expanded.

Fix: 441266548
Test: NotificationListViewModelTest, manual
Flag: com.android.systemui.scene_container
Change-Id: Idefde1f0b28ae873a520aeb755e5a454b41b2b3d