Use setDrag UI for reordering workboard columns

Summary: This UI can use the setDrag call to reduce clutter on the reodering dialog.

Test Plan:
Reorder some columns, save.

{F4959906}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17898

src/applications/project/controller/PhabricatorProjectBoardReorderController.php

@@ -94,7 +94,8 @@ final class PhabricatorProjectBoardReorderController
     $list = id(new PHUIObjectItemListView())
       ->setUser($viewer)
       ->setID($list_id)
-      ->setFlush(true);
+      ->setFlush(true)
+      ->setDrag(true);
 
     foreach ($columns as $column) {
       // Don't allow milestone columns to be reordered.
@@ -134,14 +135,9 @@ final class PhabricatorProjectBoardReorderController
         'reorderURI' => $reorder_uri,
       ));
 
-    $note = id(new PHUIInfoView())
-      ->appendChild(pht('Drag and drop columns to reorder them.'))
-      ->setSeverity(PHUIInfoView::SEVERITY_NOTICE);
-
     return $this->newDialog()
       ->setTitle(pht('Reorder Columns'))
       ->setWidth(AphrontDialogView::WIDTH_FORM)
-      ->appendChild($note)
       ->appendChild($list)
       ->addSubmitButton(pht('Done'));
   }