Implement fix to allow root admins to view all servers.

closes #722

app/Http/Middleware/AdminAuthenticate.php

@@ -11,7 +11,7 @@ namespace Pterodactyl\Http\Middleware;
 
 use Closure;
 use Illuminate\Http\Request;
-use Symfony\Component\HttpKernel\Exception\HttpException;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 
 class AdminAuthenticate
 {
@@ -25,7 +25,7 @@ class AdminAuthenticate
     public function handle(Request $request, Closure $next)
     {
         if (! $request->user() || ! $request->user()->root_admin) {
-            throw new HttpException(403, 'Access Denied');
+            throw new AccessDeniedHttpException;
         }
 
         return $next($request);