Add a missing (int) cast to diff IDs for new "transaction.search" method

Summary: These come out of the database as strings (see T12678), force them to integers for the API.

Test Plan: Called `transaction.search`, got integers in JSON instead of strings.

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D18476

src/applications/differential/xaction/DifferentialRevisionInlineTransaction.php

@@ -40,7 +40,7 @@ final class DifferentialRevisionInlineTransaction
 
     return array(
       'diff' => array(
-        'id' => $diff->getID(),
+        'id' => (int)$diff->getID(),
         'phid' => $diff->getPHID(),
       ),
       'path' => $changeset->getDisplayFilename(),