chore: fix Video audio filename

lib/pages/chat/events/audio_player.dart

@@ -66,7 +66,7 @@ class _AudioPlayerState extends State<AudioPlayerWidget> {
           await widget.event.downloadAndDecryptAttachmentCached();
       if (matrixFile == null) throw ('Download failed');
       final tempDir = await getTemporaryDirectory();
-      final fileName = widget.event.infoMap['url'] as String;
+      final fileName = widget.event.content.tryGet<String>('url')!;
       final file = File('${tempDir.path}/$fileName');
       await file.writeAsBytes(matrixFile.bytes);
 

lib/pages/chat/events/video_player.dart

@@ -41,7 +41,7 @@ class _EventVideoPlayerState extends State<EventVideoPlayer> {
         _networkUri = html.Url.createObjectUrlFromBlob(blob);
       } else {
         final tempDir = await getTemporaryDirectory();
-        final fileName = widget.event.infoMap['url'] as String;
+        final fileName = widget.event.content.tryGet<String>('url')!;
         final file = File('${tempDir.path}/$fileName');
         if (await file.exists() == false) {
           await file.writeAsBytes(videoFile.bytes);