fix(player): 使用雪碧图预热首帧兜底

lib/pages/player/widgets/player_overlay.dart

@@ -303,7 +303,6 @@ class PlayerPlaybackOverlay extends StatelessWidget {
         spriteAxisService: data.spriteAxisService,
         thumbnailsUrl: data.episode.thumbnailsUrl,
         episodeId: data.episode.id,
-        posterUrl: data.drama.posterUrl,
         inactiveTrackColor: AppColors.inactiveTrack,
         onScrubStart: actions.onScrubStart,
         onScrubEnd: actions.onScrubEnd,