Fix missing 'user' in PhabricatorOwnerPathQuery

Summary:
See:

  - https://github.com/facebook/phabricator/issues/317
  - https://github.com/facebook/phabricator/issues/319

This callsite was just overlooked in D5928, I think.

Test Plan: Ran `scripts/repository/reparse.php --owners rXnnnn` without hitting an exception.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D5930