Closes #556: Link movie volume to 'master' volume slider, instead of 'music'.

apps/openmw/mwsound/soundmanagerimp.cpp

@@ -156,11 +156,12 @@ namespace MWSound
                 volume *= mFootstepsVolume;
                 break;
             case Play_TypeMusic:
-            case Play_TypeMovie:
                 volume *= mMusicVolume;
                 break;
             case Play_TypeMask:
                 break;
+            default:
+                break;
         }
         return volume;
     }