optimize：优化代码

static/webRtcYJ/WXtrialInterface.html

@@ -467,7 +467,6 @@
         let data = e.data;
         let bool = isVideo && !$('#playCanvas').is(':visible') && !isShowiPhoneWebRTC
         if(data.bool) {
-          getResidueTimeBool = true
           if (bool) {
           document.getElementById('playVideo').play();
         }