Add dependency mock when scene container is enabled

Using real SysUIStateDisplaysInteractor thru Dependency.get leads to crashes when scene container is enabled.

Flag: com.android.systemui.scene_container
Fixes: 410078024
Test: atest MediaOutputDialogScreenshotTest
Test: atest CallStyleNotificationScreenshotTest
Change-Id: Ie8ffbaa9da8e19cd4622caace2e381a83b5b24af