change page navigation

lib/pages/staff/staff_editor.dart

@@ -8,6 +8,7 @@ import 'package:fcs/pages/staff/model/staff_model.dart';
 import 'package:fcs/pages/widgets/display_text.dart';
 import 'package:fcs/pages/widgets/local_text.dart';
 import 'package:fcs/pages/widgets/progress.dart';
+import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -170,7 +171,8 @@ class _StaffEditorState extends State<StaffEditor> {
           appBar: AppBar(
             centerTitle: true,
             leading: new IconButton(
-              icon: new Icon(Icons.close, color: primaryColor, size: 30),
+              icon:
+                  new Icon(CupertinoIcons.back, color: primaryColor, size: 30),
               onPressed: () => Navigator.of(context).pop(),
             ),
             shadowColor: Colors.transparent,