Fix door opening sound

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

packages/wolf_3d_engine/lib/src/engine_audio.dart

@@ -2,6 +2,7 @@ import 'package:wolf_3d_data_types/wolf_3d_data_types.dart';
 
 abstract class EngineAudio {
   WolfensteinData? activeGame;
+  Future<void> debugSoundTest();
   void playMenuMusic();
   void playLevelMusic(WolfLevel level);
   void stopMusic();

packages/wolf_3d_engine/lib/src/silent_renderer.dart

@@ -31,4 +31,9 @@ class CliSilentAudio implements EngineAudio {
 
   @override
   void dispose() {}
+
+  @override
+  Future<void> debugSoundTest() async {
+    return Future.value(null);
+  }
 }