Crash if Shade window config forwarder is instantiated when the flag is off

This makes sure we never try to access the new @ShadeDisplayAware ConfigurationForwarder when the ShadeWindowGoesAround flag is off

Bug: 362719719
Bug: 374267505
Test: SysUI unit tests
Flag: com.android.systemui.shade_window_goes_around
Change-Id: I34a0d04255de26506ba07a7eb2bc14db93d2e141
4 files changed