Conpherence - actually remove route from feedback in D12215

Summary: pebkac issue of some sort and I didn't actually commit removing the defunct /conpherence/room/ uri route

Test Plan: made a new room and it worked

Reviewers: chad, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12216