Hide the "Author" field in Differential on the web create workflow
Ref T13628. When creating a revision, hide the recently introduced "Author" field.
It seems exceedingly unlikely that anyone would ever want to adjust this field when creating a revision, and this workflow already has a lot of fields and complexity, so this likely adds more noise than signal on the balance.
- Created revisions via copy/paste on the web workflow, no longer saw "Author".
- Used "Edit Revision" to adjust the author normally.
Maniphest Tasks: T13628
Differential Revision: https://secure.phabricator.com/D21595