Trashing redirects to home instead of forum depending on capabilities - fix included

[mattrabe]

If user has delete_topics capability but not view_trash capability, trashing a topic from the topic page produces a redirect_to value of bbp_get_topic_permalink( $r['id'] ), but since the user cannot viewed that newly-trashed topic, they end up double-redirected to home. This seems counter-intuitive, and I feel that the appropriate action is to set redirect_to to bbp_get_forum_permalink( $retval['status']->post_parent ) (parent forum page) instead.

I am currently using 2.6-beta-2. Change has been made on my end, I will commit a patch shortly.

[johnjamesjacoby]

In 6504:

Topics: Redirect to forum when trashing a topic and the user cannot view trash.

Fixes #3111. Props mattrabe.