Fix Account Controller unittest

Author: Ramón Tomás

test/Services/UnitTest/Account/AccountControllerTest.cs

@@ -1,16 +1,9 @@
-using Microsoft.AspNetCore.Authentication;
-using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Authentication;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.eShopOnContainers.WebMVC.Controllers;
-using Microsoft.eShopOnContainers.WebMVC.Services;
-using Microsoft.eShopOnContainers.WebMVC.ViewModels;
 using Moq;
-using System;
-using System.Collections.Generic;
 using System.Security.Claims;
-using System.Text;
-using System.Threading.Tasks;
 using Xunit;
 
 namespace UnitTest.Account