修复流注册事件track和regist字段缺失的bug

server/WebHook.cpp

@@ -301,14 +301,15 @@ void installWebHook(){
             return;
         }
         ArgsType body;
-        body["regist"] = bRegist;
         if (bRegist) {
             body = makeMediaSourceJson(sender);
+            body["regist"] = bRegist;
         } else {
             body["schema"] = sender.getSchema();
             body["vhost"] = sender.getVhost();
             body["app"] = sender.getApp();
             body["stream"] = sender.getId();
+            body["regist"] = bRegist;
         }
         //执行hook
         do_http_hook(hook_stream_chaned,body, nullptr);