Apply fixes from StyleCI

app/Server/Http/Controllers/Admin/AdminController.php

@@ -5,7 +5,6 @@ namespace App\Server\Http\Controllers\Admin;
 use App\Http\Controllers\Controller;
 use GuzzleHttp\Psr7\Message;
 use GuzzleHttp\Psr7\Response;
-use function GuzzleHttp\Psr7\str;
 use Illuminate\Http\Request;
 use Illuminate\Support\Str;
 use Ratchet\ConnectionInterface;