add pin login and add pin code

lib/pages/staff/staff_pin_editor.dart

@@ -310,7 +310,7 @@ class _StaffPinEditorState extends State<StaffPinEditor> {
       await context.read<StaffModel>().updatePin(
           userID: _staff.id!,
           enablePin: _enablePinLogin,
-          pin: _enablePinLogin ? int.parse(_confirmPin) : null);
+          pin: _enablePinLogin ? _confirmPin : null);
       Navigator.pop(context, true);
     } catch (e) {
       showMsgDialog(context, "Error", e.toString());