Fix @mbabkers composer bug #5021 (JArrayHelper not loaded)


Steps to reproduce the issue

In backend go to Menus > any option.
Expected result

Load the menus
Actual result

Shows white page, enabled error reporting and found this error:
Fatal error: Class 'JArrayHelper' not found in ../libraries/legacy/model/list.php on line 372
System information (as much as possible)
Additional comments