Play (wrong) door sound effect when the door opens or closes

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/screens/difficulty_screen.dart

@@ -30,6 +30,7 @@ class _DifficultyScreenState extends State<DifficultyScreen> {
           Wolf3d.I.activeGame,
           difficulty: difficulty,
           startingEpisode: Wolf3d.I.activeEpisode,
+          audio: Wolf3d.I.audio,
         ),
       ),
     );