criado o modelo city_load_model.dart a tela login_load_screen.dart e sync_unit_screen.dart

lib/models/args_load_init_model.dart

@@ -1,13 +1,15 @@
+import 'city_load_model.dart';
+
 class ArgsLoadInitModel{
   String mode;
-  String city;
+  CityLoadModel model;
   String user;
   String password;
   String urlAPI;
 
   ArgsLoadInitModel({
     required this.mode,
-    required this.city,
+    required this.model,
     required this.user,
     required this.password,
     required this.urlAPI,