R1:a55c4a651ea5

Arcanist Project migration uses wrong column in old table

Summary: Fixes T8375. This column is `repositoryID`, not `repository`.

Test Plan: Examined schema.

Reviewers: joshuaspence, btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T8375

Differential Revision: https://secure.phabricator.com/D13097