Push typehead browse result selector button down one <div>

Summary: Fixes T11190. The div with all the stuff in it was sometimes ending up on top of the "select" button, making it unclickable.

Test Plan: Clicked "select" in several browsers.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11190

Differential Revision: https://secure.phabricator.com/D16160