界面微调，设备连接中断跳时间bug修复

Assets/Scenes/Ride/Scripts/DeviceServiceMonoBase.cs

@@ -23,6 +23,7 @@ namespace Assets.Scenes.Ride.Scripts
         {
             get {
                 var devices = AntConnector.Instance().discoveredDevices.Where(d => d.State == DeviceState.Connected && (d.Sensor == SensorType.Trainer));
+                _device = null;//重置设备状态
                 if (devices.Count() > 0)
                 {
                     _device = devices.OrderByDescending(d => d.Sensor == SensorType.Trainer).First();