Media Viewer: Fix stuck UI after deleting media message (#3047)

src/components/mediaViewer/MediaViewer.tsx

@@ -151,6 +151,7 @@ const MediaViewer: FC<StateProps> = ({
   }
 
   const [getIsPictureInPicture] = usePictureInPictureSignal();
+
   useEffect(() => {
     if (!isOpen || getIsPictureInPicture()) {
       return undefined;

src/components/mediaViewer/MediaViewerSlides.tsx

@@ -143,6 +143,10 @@ const MediaViewerSlides: FC<OwnProps> = ({
 
   useTimeout(() => setControlsVisible(true), ANIMATION_DURATION);
 
+  useEffect(() => {
+    setActiveMediaId(mediaId);
+  }, [mediaId, setActiveMediaId]);
+
   useLayoutEffect(() => {
     const { x, y, scale } = getTransform();
     lockControls(scale !== 1);