Removed all the unused directives in the Solution with the assistance of Resharper

src/Web/Views/Account/LoginWith2fa.cshtml

@@ -1,4 +1,3 @@
-@using Microsoft.eShopWeb.Web.ViewModels.Account
 @model LoginWith2faViewModel
 @{
     ViewData["Title"] = "Two-factor authentication";

src/Web/Views/Account/Register.cshtml

@@ -1,7 +1,3 @@
-@using System.Collections.Generic
-@using Microsoft.AspNetCore.Http
-@using Microsoft.AspNetCore.Http.Authentication
-@using Microsoft.eShopWeb.Web.ViewModels.Account
 @model RegisterViewModel
 @{
     ViewData["Title"] = "Register";

src/Web/Views/Account/Signin.cshtml

@@ -1,4 +1,3 @@
-@using Microsoft.eShopWeb.Web.ViewModels.Account
 @model LoginViewModel
 @{
     ViewData["Title"] = "Log in";