Bugfix comment permissions

Updates policies to match client side display rules for tasks.

References: https://www.pivotaltracker.com/story/show/79563784

### AC & CT
Extra whitespace.

![](http://media.tumblr.com/f630fd5fafba853484af0050c0ed6213/tumblr_inline_mub6s6OL8i1r9dv7p.jpg)