Provide reference to BrightnessController in DisplayApp

For the simulator I need a way to get to the brightnessController object
and handle the set brightness-levels accoringly.

This is done by the constructor expecting a brightnessController object
instead of initializing one itself

src/displayapp/DisplayAppRecovery.cpp

@@ -23,6 +23,7 @@ DisplayApp::DisplayApp(Drivers::St7789& lcd,
                        Pinetime::Controllers::MotionController& motionController,
                        Pinetime::Controllers::TimerController& timerController,
                        Pinetime::Controllers::AlarmController& alarmController,
+                       Pinetime::Controllers::BrightnessController& brightnessController,
                        Pinetime::Controllers::TouchHandler& touchHandler)
   : lcd {lcd}, bleController {bleController} {