TF-1694 Fix the Cancel/Save button is hidden

(cherry picked from commit b469d1389d945128bfe569ce252c6d759ef1e06a)

lib/main/pages/app_pages.dart

@@ -1,3 +1,5 @@
+import 'dart:io';
+
 import 'package:core/core.dart';
 import 'package:get/get.dart';
 import 'package:get/get_navigation/src/routes/get_route.dart';
@@ -111,7 +113,7 @@ class AppPages {
           binding: SearchMailboxBindings()),
         GetPage(
           name: AppRoutes.identityCreator,
-          opaque: false,
+          opaque: Platform.isAndroid ? true : false,
           page: () => DeferredWidget(
             identity_creator.loadLibrary,
             () => identity_creator.IdentityCreatorView()