Fix a copy/paste error on the burnup chart

Summary: See PHI286, maybe. See PHI273. Strongly considering just deleting this.

Test Plan: ~.~

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D18865

src/applications/maniphest/controller/ManiphestReportController.php

@@ -140,7 +140,7 @@ final class ManiphestReportController extends ManiphestController {
       }
 
       $oldv = trim($row['oldValue'], '"');
-      $newv = trim($row['oldValue'], '"');
+      $newv = trim($row['newValue'], '"');
 
       // If this is a status change, preserve it.
       if ($oldv != 'null') {