Fix full width form layouts

Summary: Fixes T3473, mostly reverts previous changes to clean up required field text, will have to redesign that in general for responsiveness.

Test Plan: use logout form, use new conpherence form

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T3473

Differential Revision: https://secure.phabricator.com/D6371