Added `data-comments-enabled` attribute to comments helper
Added `data-comments-enabled` attribute to comments helper

refs https://github.com/TryGhost/Team/issues/1693

- The comments section needs to know the access settings for comments
- Updated the comments helper to also double check access settings (comments enabled + member has access to the post)

TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost