Media: Refresh window also at QUIT event.

* Since the Media preferences are always watching for media
  status, it's good to clean up the window when the media services
  are not running. This avoid the user try to use controls where
  services are down.

src/preferences/media/MediaWindow.cpp

@@ -192,6 +192,8 @@ MediaWindow::MediaWindow(BRect frame)
 	BMediaRoster* roster = BMediaRoster::Roster();
 	roster->StartWatching(BMessenger(this, this),
 		B_MEDIA_SERVER_STARTED);
+	roster->StartWatching(BMessenger(this, this),
+		B_MEDIA_SERVER_QUIT);
 }
 
 
@@ -217,6 +219,8 @@ MediaWindow::~MediaWindow()
 	BMediaRoster* roster = BMediaRoster::CurrentRoster();
 	roster->StopWatching(BMessenger(this, this),
 		B_MEDIA_SERVER_STARTED);
+	roster->StartWatching(BMessenger(this, this),
+		B_MEDIA_SERVER_QUIT);
 }
 
 
@@ -337,6 +341,7 @@ MediaWindow::MessageReceived(BMessage* message)
 				resume_thread(fRestartThread);
 			break;
 		}
+
 		case B_MEDIA_WEB_CHANGED:
 		case ML_SELECTED_NODE:
 		{
@@ -352,12 +357,15 @@ MediaWindow::MessageReceived(BMessage* message)
 			item->AlterWindow(this);
 			break;
 		}
+
 		case B_MEDIA_SERVER_STARTED:
+		case B_MEDIA_SERVER_QUIT:
 		{
 			PRINT_OBJECT(*message);
 			_InitMedia(false);
 			break;
 		}
+
 		default:
 			BWindow::MessageReceived(message);
 			break;