admin: remove obsolet header => true tag + php code fix

src/Bundle/ChillAsideActivityBundle/src/Controller/AdminController.php

@@ -26,5 +26,4 @@ class AdminController extends AbstractController
     {
         return $this->render('ChillAsideActivityBundle:Admin:index.html.twig');
     }
-
 }

src/Bundle/ChillAsideActivityBundle/src/Menu/AdminMenuBuilder.php

@@ -14,8 +14,6 @@ namespace Chill\AsideActivityBundle\Menu;
 use Knp\Menu\MenuItem;
 use Symfony\Component\Security\Core\Security;
 
-use function in_array;
-
 final class AdminMenuBuilder implements \Chill\MainBundle\Routing\LocalMenuBuilderInterface
 {
     private Security $security;
@@ -38,7 +36,6 @@ final class AdminMenuBuilder implements \Chill\MainBundle\Routing\LocalMenuBuild
             ->setAttribute('class', 'list-group-item-header')
             ->setExtras([
                 'order' => 7000,
-                'header' => true,
                 'explain' => 'Aside activity type configuration',
             ]);
         $menu