Remove redundant using

Author: russdaygh

PocketDDD.Server/PocketDDD.Server.WebAPI/Controllers/RegistrationController.cs

@@ -1,5 +1,4 @@
-using Microsoft.AspNetCore.Authorization;
-using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using PocketDDD.Server.Model.DTOs;
 using PocketDDD.Server.Services;