TD-3903 Remove reference that is not needed in User service

Author: sherif-olaboye

DigitalLearningSolutions.Web/Services/UserService.cs

@@ -4,13 +4,10 @@ namespace DigitalLearningSolutions.Web.Services
     using System.Collections.Generic;
     using System.ComponentModel.DataAnnotations;
     using System.Linq;
-    using System.Net.Mail;
     using DigitalLearningSolutions.Data.DataServices;
     using DigitalLearningSolutions.Data.DataServices.UserDataService;
     using DigitalLearningSolutions.Data.Exceptions;
     using DigitalLearningSolutions.Data.Models;
-    using DigitalLearningSolutions.Data.Models.Centres;
-    using DigitalLearningSolutions.Data.Models.Email;
     using DigitalLearningSolutions.Data.Models.User;
     using DigitalLearningSolutions.Data.Utilities;
     using Microsoft.Extensions.Configuration;