Remove ACL checks for specific menu item

Current ACL checks are causing unexpected results as ACL is only available for com_menus in general. So no need to check for ACL settings for com_menus.item.XX, only com_menus available.

## Test instructions:
- create a new user group
- allow "backend access" for this group in the global configuration permissions
- allow "Access Administration Interface" and "Edit State" action for the Menu Manager for the group
- create test user, assign to created group
- login with test user
- try to publish/unpublish a menu item. Result: "Edit state not permitted".
- apply patch
- try to publish/unpublish a menu item. Result: "1 menu item successfully unpublished/published"