修复添加、删除楼层时候，界面刷新异常问题

wei

2020-12-25 f534d41c36d5895322bf691784a10435b64609fe

 HDL-ON_iOS/Scan.cs

@@ -35,7 +35,6 @@
                var bOn = false;
                mZXingOverlayView.OnCancel += () =>
                {

                    scanner?.Cancel();
                };