Properly name database in patch list

Summary:
Blames to D3659.
It's not that old (< 1 day) to fix it properly (add patch for dropping xhpast DB).

Test Plan:

$ arc unit src/applications/calendar/storage/__tests__/PhabricatorCalendarHolidayTestCase.php

Reviewers: btrahan, epriestley

Reviewed By: btrahan

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3670