Code cleanup.

src/Squidex/Config/Authentication/GithubHandler.cs

@@ -8,7 +8,6 @@
 using System.Security.Claims;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Authentication.OAuth;
-using Squidex.Infrastructure;
 using Squidex.Shared.Identity;
 
 namespace Squidex.Config.Authentication

src/Squidex/Config/Authentication/GoogleHandler.cs

@@ -5,7 +5,6 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using System.Linq;
 using System.Security.Claims;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Authentication;