net-mgmt/zabbix44-[proxy|server]: Avoid conflicts with bin/zabbix_js

Same approach in Zabbix 5.

Another way is having another slave port, zabbix44-js just for this file.

PR: 245037
Reported by: Aleksandr Ignatyev <alex@i.org.ua>
Approved by: maintainer timeout (pg@pakhom.spb.ru, > 2 months)