Default Conpherence Room Search to All Rooms

Summary: Just changes the default here. Main reasoning is if I'm searching for a room, show me all of them first. "My Rooms" is where I just came from.

Test Plan: Click Search in Conpherence, see All Rooms as default.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D16527