Joomla::synchronizeUsers - Fix notice due to old style reference

[totten]

Overview

This fixes a PHP notice when synchronizing all users/contacts.

Before

PHP Notice:  Only variables should be assigned by reference in ...CRM/Utils/System/Joomla.php:855

After

No notice.

Comments

I think I got this notice originally while running authx's AllFlowsTest. You can probably replicate with something like

cv ev '\CRM_Utils_System::synchronizeUsers();'

[civibot]

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[eileenmcnaughton]

yeah - that looks like it was wrong