update pagination listener

lib/pages/customer/model/customer_model.dart

@@ -7,8 +7,11 @@ import 'package:fcs/domain/entities/user.dart';
 import 'package:fcs/pages/main/model/base_model.dart';
 import 'package:logging/logging.dart';
 
+import '../../../pagination/paginator_listener.dart';
+
 class CustomerModel extends BaseModel {
   final log = Logger('CustomerModel');
+  PaginatorListener<User>? getCustomers;
 
   List<User> customers = [];
   List<User> invitations = [];
@@ -28,8 +31,11 @@ class CustomerModel extends BaseModel {
     if (invitationListener != null) invitationListener!.cancel();
     customers = [];
     invitations = [];
+    getCustomers?.close();
   }
 
+  
+
   Future<void> inviteUser(String userName, String phoneNumber) {
     return Services.instance.userService.inviteUser(userName, phoneNumber);
   }