更新 当会话存在source，发送消息时以chat_source带上

pages/chat/chat.nvue

@@ -1227,6 +1227,10 @@
         return ids
       },
       sendMsg(msg, callback) {
+        if(this.conversation.source){
+          msg.chat_source = this.conversation.source
+        }
+        
         // console.log('sendMsg-sendMsg-sendMsg', msg);
         const uniImCo = uniCloud.importObject('uni-im-co', {
           customUI: true