优化了萤石功能，增加了对讲权限

hxb

2021-07-21 8e8155ee4ab7f9990ae42bc3d1306c537bacf487

 HDL-ON_iOS/Scan.cs

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

                    scanner?.Cancel();
                };