Use relatives in commit summary migration

Test Plan: Ran it on test DB.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5061

resources/sql/patches/20130219.commitsummarymig.php

@@ -10,9 +10,9 @@ foreach ($commits as $commit) {
     continue;
   }
 
-  $data = id(new PhabricatorRepositoryCommitData())->loadOneWhere(
-    'commitID = %d',
-    $commit->getID());
+  $data = $commit->loadOneRelative(
+    new PhabricatorRepositoryCommitData(),
+    'commitID');
 
   if (!$data) {
     continue;