优化 当没有连接上 AD盒， AD盒的默认值 由 Backup_XXXX 控制

Project.FLY.FlyADBase/FlyADBase/FlyAD7.cs

@@ -1818,6 +1818,13 @@ namespace FlyADBase
 
             this.PropertyChanged -= FlyAD7_PropertyChanged2;
             bool ret = FlyAD7JsonDb.Load(jsonDbPath, this);
+
+            PosOfGrid = Backup_PosOfGrid;
+            MotorType = Backup_MotorType;
+            Ratio01 = Backup_Ratio01;
+            Ratio02 = Backup_Ratio02;
+            PosOffset = Backup_PosOffset;
+            JogVelocity = Backup_JogVelocity;
             this.PropertyChanged += FlyAD7_PropertyChanged2;
             
             return ret;