Clear floats around conpherence-edited transactions

Summary: Fixes T7647. We float both the time and description here and want the fluidity.

Test Plan: Review a new Conpherence in FF, Safari, Chrome.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7647

Differential Revision: https://secure.phabricator.com/D12137