my-account: fixed pagination of unread messages

rhodecode/apps/my_account/views/my_account_notifications.py

@@ -73,7 +73,9 b' class MyAccountNotificationsView(BaseApp'
                 'page': page_num
             }
             _query = self.request.GET.mixed()
-            query_params.update(_query)
+            _query.update(query_params)
+            query_params = _query
+
             return self.request.current_route_path(_query=query_params)
 
         c.notifications = SqlPage(notifications, page=p, items_per_page=10,