Update CssMenu.php

Remove obsolete use Joomla\CMS\Factory, not highlighted during merge.

Author: Bodge-IT

administrator/modules/mod_menu/src/Menu/CssMenu.php

@@ -13,7 +13,6 @@
 use Joomla\CMS\Application\CMSApplication;
 use Joomla\CMS\Component\ComponentHelper;
 use Joomla\CMS\Event\Menu\PreprocessMenuItemsEvent;
-use Joomla\CMS\Factory;
 use Joomla\CMS\Language\Associations;
 use Joomla\CMS\Language\Text;
 use Joomla\CMS\Menu\AdministratorMenuItem;