[Flexiglass] Disable forced scrolling the NSSL

This was a non-functional code path in the NSSL, because it cannot
control its own scrolling anymore. So the _scroll to active remote
input_ was not workign before this change either.

Bug: 360091533
Test: activate remote input on a notification -> no crashes
Flag: com.android.systemui.scene_container
Change-Id: I33b9e0da787f7517e6127b26919da8b40aeb7f84