Fix doubling of unbroken build steps in Build Plan view

Summary: Fixes T10479.

Test Plan: Viewed a valid build plan.

Reviewers: hach-que, tycho.tatitscheff, chad

Reviewed By: chad

Maniphest Tasks: T10479

Differential Revision: https://secure.phabricator.com/D15368

src/applications/harbormaster/controller/HarbormasterPlanViewController.php

@@ -187,8 +187,6 @@ final class HarbormasterPlanViewController extends HarbormasterPlanController {
       if ($is_deadlocking) {
         $item->setStatusIcon('fa-warning red');
       }
-
-      $step_list->addItem($item);
     }
 
     $step_list->setFlush(true);