Correct `notification.pid` to `notification.pidfile`
Summary:
The correct conf variable is notification.pidfile, not notification.pid.
See also:
* src/applications/config/option/PhabricatorNotificationConfigOptions.php:58
* src/applications/aphlict/management/PhabricatorAphlictManagementWorkflow.php:34
Test Plan:
Grepped the whole source of Phabricator for occurences of `notification.pid`,
but all matches pointed to `notification.pidfile` instead.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D11768
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