[Dual Shade] Fix HUN position over LS QS

HUN showed lower than intended over lock screen quick settings
because the correct headsUpTop Y from the placeholder
was overridden by incorrect yTranslation

Propagate isQsOverlayVisible (and use placeholder Y when true):
SceneInteractor -> NotificationListViewBinder
-> NotificationStackScrollLayoutController
-> NotificationStackScrollLayout -> AmbientState
-> StackScrollAlgorithm

Fixes: 436730145
Test: StackScrollAlgorithmTest
Test: HUN shows at correct position over QS overlay in dual shade
Test: no change to HUN placement in classic shade with flexi on
Flag: com.android.systemui.scene_container
Change-Id: I5d41d0b0184e972af953b344fe168e0cbd6fe351