2021-01-12 1.备份上传和下载相关接口调整，和优化。

JLChen

2021-01-12 6f17148ec371799405ff351ba8947ba9fdece797

 Crabtree/ON/Application.cs

@@ -332,7 +332,7 @@
                closeTime = DateTime.Now;
            } else if (closeTime.AddSeconds (20) < DateTime.Now) {
                if (CommonPage.IsRemote) {
                    SmartHome.MqttCommon.DisConnectRemoteMqttClient ("closeTime");
                    MqttCommon.DisConnectRemote ("closeTime", false);
                }
            }