Rename Differenital "EditPro" controller back to "Edit"

Summary: Ref T11114. We seem to be in reasonable shape here and I don't think anything needs to revert, so rename this back to boring old "edit".

Test Plan: Created, updated, edited a revision via web UI.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11114

Differential Revision: https://secure.phabricator.com/D17091