TD-3953: Removed unused namespace

Author: ArunimaGeorge

LearningHub.Nhs.WebUI/Controllers/AccountController.cs

@@ -20,7 +20,6 @@
     using LearningHub.Nhs.WebUI.Helpers;
     using LearningHub.Nhs.WebUI.Interfaces;
     using LearningHub.Nhs.WebUI.Models.Account;
-    using LinqToTwitter.Provider;
     using Microsoft.AspNetCore.Authorization;
     using Microsoft.AspNetCore.Hosting;
     using Microsoft.AspNetCore.Http.Features;