Remove the feature link from the trash and spam pages

Applies to https://github.com/GigaOM/gigaom/issues/5248

Using the global set in `bSocial_Comments_Feedback_Table` to filter for the trash and spam pages and bail before outputting the feature link.
I think you were more right with [the switch](https://github.com/Camwyn/bsocial-comments/commit/f82c2d789a97feb763faa3b9df64c08c5998c3ef), which may be necessary for the additional comment statuses @methnen says exist.