Provide correct context on cast dialog creation

The dialog context was the shade one, that is now a TYPE_NOTIFICATION_SHADE window context. We can't create dialogs from that.

This uses the context created from ShadeDialogContextInteractor (that is DIALOG_WINDOW_TYPE)

Bug: 362719719
Bug: 383294128
Test: open cast dialog from QS
Flag: com.android.systemui.shade_window_goes_around
Change-Id: I216b2a010c3260951f4a238c7771fe02744ad786