update rate

lib/pages/discount/discount_list.dart

@@ -20,6 +20,16 @@ class DiscountList extends StatefulWidget {
 
 class _DiscountListState extends State<DiscountList> {
   bool _isLoading = false;
+  bool _selected = false;
+
+  @override
+  void initState() {
+    super.initState();
+    if (widget.selected != null) {
+      _selected = widget.selected;
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     var discountModel = Provider.of<DiscountModel>(context);
@@ -53,7 +63,7 @@ class _DiscountListState extends State<DiscountList> {
             var discount = discountModel.discounts[index];
             return InkWell(
               onTap: () {
-                widget.selected
+                _selected
                     ? Navigator.pop(context, discount)
                     : Navigator.push(
                         context,