cleanup: Remove expired bareos18 ports:
2023-06-01 sysutils/bareos18-client: Upstream EOL reached on 2020-02-03
2023-06-01 sysutils/bareos18-server: Upstream EOL reached on 2020-02-03
2023-06-01 sysutils/bareos18-traymonitor: Upstream EOL reached on 2020-02-03