3821 Delete draft from drafts index with JavaScript disabled

https://code.google.com/p/otwarchive/issues/detail?id=3821

If you went to /users/USERNAME/works/drafts to delete a work, the delete link would only take you to the draft itself. Now it takes you to the delete form, which will now talk about deleting drafts instead of works when that is what you’re doing.

Please merge https://github.com/otwcode/otwarchive/pull/1403 first.