Remove nonfunctional/obsolete 'reconcile.php'

Summary: Ref T4780. This no longer works and barely ever worked. T4237 is now the relevant task.

Test Plan: Grepped for reconcile.php

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4780

Differential Revision: https://secure.phabricator.com/D8739