Don't run "aphlict-listen" behavior if real-time notifications are disabled
Summary: Fixes T5277. We incorrectly ran this unconditionally.
Test Plan: Toggled setting on/off, verified behavior ran or did not run.
Reviewers: joshuaspence
Reviewed By: joshuaspence
Subscribers: epriestley
Maniphest Tasks: T5277
Differential Revision: https://secure.phabricator.com/D9418