fix url appends two sign bug

Flutter/example/lib/superplayer/superplayer_controller.dart

@@ -399,7 +399,7 @@ class SuperPlayerController {
         }
       }
       query += "spfileid=${videoModel!.videoId!.fileId}" "&spdrmtype=$drmType&spappid=${videoModel!.appId}";
-      Uri newUri = Uri(path: url, query: query);
+      Uri newUri = uri.replace(query: query);
       LogUtils.d(TAG, 'playVodURL: newurl =  ${Uri.decodeFull(newUri.toString())}  ;url=  $url');
       await _vodPlayerController.startVodPlay(Uri.decodeFull(newUri.toString()));
     } else {