closes https://github.com/TryGhost/Team/issues/2572
The mentions browse output previously only showed resource info if the
mentioned resource type was a `post`.
Additionally, the `resource_type` column basically defaulted to `post`
regardless whether it was a page or in fact a post.
With this change we now have `resource_type` wired in to correctly
determine if the mentioned url was a page or a post.
