SystemTask: Move MotorController to DisplayApp

Vibrations should be associated with something happening on the UI.
Therefore SystemTask should not be controlling the motor.

src/components/alarm/AlarmController.cpp

@@ -104,5 +104,4 @@ void AlarmController::StopAlerting() {
     // set next instance
     ScheduleAlarm();
   }
-  systemTask->PushMessage(System::Messages::StopRinging);
 }