fix increasing brightness

brightness decreases after leaving "gift card barcode screen"

lib/utils/route_aware.dart

@@ -0,0 +1,65 @@
+import 'package:flutter/material.dart';
+import 'package:cake_wallet/main.dart';
+
+class RouteAwareWidget extends StatefulWidget {
+  RouteAwareWidget(
+      {required this.child,
+      this.pushToWidget,
+      this.pushToNextWidget,
+      this.popWidget,
+      this.popNextWidget});
+
+  final Widget child;
+  final Function()? pushToWidget;
+  final Function()? pushToNextWidget;
+  final Function()? popWidget;
+  final Function()? popNextWidget;
+
+  @override
+  State<RouteAwareWidget> createState() => RouteAwareWidgetState();
+}
+
+class RouteAwareWidgetState extends State<RouteAwareWidget> with RouteAware {
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    routeObserver.subscribe(this, ModalRoute.of(context) as PageRoute);
+  }
+
+  @override
+  void dispose() {
+    routeObserver.unsubscribe(this);
+    super.dispose();
+  }
+
+  @override
+  void didPush() {
+    if (widget.pushToWidget != null) {
+      widget.pushToWidget!();
+    }
+  }
+
+  @override
+  void didPushNext() {
+    if (widget.pushToNextWidget != null) {
+      widget.pushToNextWidget!();
+    }
+  }
+
+  @override
+  void didPop() {
+    if (widget.popWidget != null) {
+      widget.popWidget!();
+    }
+  }
+
+  @override
+  void didPopNext() {
+    if (widget.popNextWidget != null) {
+      widget.popNextWidget!();
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) => widget.child;
+}