bugfix：处理屏幕黑屏问题

static/webRtcYJ/WXtrialInterface.html

@@ -1363,7 +1363,7 @@
               ip +
               ':' +
               port +
-              '/index/api/webrtc?app=live&stream=test&type=play';
+              '/index/api/webrtc?app=live&stream=h264&type=play';
             wsUrl = 'ws://' + ip + ':' + port + '/plugflow';
           }
           let token = res.data.cardToken;