Fix herald "Repository" rule for Revisions and Diffs

Summary: This was broken by rP5ac36e8 by a derpy typo.

Test Plan: Ran dry run against a revision with a a repository, saw the field fill in on the transcript.

Reviewers: nickz, btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D10326

src/applications/herald/adapter/HeraldDifferentialAdapter.php

@@ -27,7 +27,7 @@ abstract class HeraldDifferentialAdapter extends HeraldAdapter {
           ->needProjectPHIDs(true)
           ->executeOne();
       }
-      $this->repository = false;
+      $this->repository = $repository;
     }
 
     return $this->repository;