opt: let permissions unique to prevent same permission check pass through

Fixed #1

src/Middleware/Permission.php

@@ -30,7 +30,7 @@ class Permission extends \Encore\Admin\Middleware\Permission
         if ($this->checkRoutePermission($request)) {
             return $next($request);
         }
-        if (!$user->roles->pluck('permissions')->flatten()->merge($user->permissions)->first(function ($permission) use ($request) {
+        if (!$user->roles->pluck('permissions')->flatten()->merge($user->permissions)->unique('id')->first(function ($permission) use ($request) {
             return $permission->shouldPassThrough($request);
         })) {
             Checker::error();