fix(card): adjust test snapshot signature

entry/src/main/ets/common/player/MusicCardManager.ets

@@ -40,7 +40,7 @@ export class MusicCardManager {
   }
 
   static buildSnapshotForTest(
-    song?: VideoItem,
+    song: VideoItem | undefined,
     isPlaying: boolean,
     positionMs: number,
     durationMs: number,