Make the editor use the subtitle workflow permissions check

Before it was using can_add_version() which is only correct for
old-style teams.

Also switched the old style team workflow to use can_add_version().
Before it was using can_create_and_edit_subtitles(), which I think is
subtly different.
Bumping unisubs-integration repo

This pulls in some other fixes to make the API work with subtitle
workflows.
Fixed conflict due to commit number in unisubs-integration