Breaks Dolibarr CRM (ref stripping rule)

see https://github.com/ClearURLs/Addon/issues/486

Dolibarr CRM/billing/member management system makes use of ref= (https://wiki.dolibarr.org/index.php/Online_Payment_Module_Architecture)

Anything under /dolibarr/ must at least be exempted from the (?:%3F)?ref_? rule. It can lead to awfully hard to debug payment/connection errors. Such a broad rule for such a common parameter is a filtering anti-pattern (and nightmare).

Please fix