Fix --ssl-cert for Aphlict

Summary: PhabricatorAphlictManagementWorkflow passes --ssl-cert but aphlict_server.js expects --ssl-certificate.

Test Plan: Tested on a production system.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11283