change page navigation

lib/pages/rates/custom_editor.dart

@@ -4,6 +4,7 @@ import 'package:fcs/localization/app_translations.dart';
 import 'package:fcs/pages/main/util.dart';
 import 'package:fcs/pages/widgets/input_text.dart';
 import 'package:fcs/pages/widgets/progress.dart';
+import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 
@@ -54,7 +55,7 @@ class _CustomEditorState extends State<CustomEditor> {
           centerTitle: true,
           leading: new IconButton(
             icon: new Icon(
-              Icons.close,
+              CupertinoIcons.back,
             ),
             onPressed: () => Navigator.of(context).pop(),
           ),