R1:234123b92520

Remove double padding on project task list

Summary: SInce we added the background color, no need to add extra padding for ObjectItemList.

Test Plan: reload a project page, no white padding in object box.

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7866