Dont let posts link to unapproved / rejected crops

[Br3nda]

If there are more than one crop matching in growstuff markdown in a post, definitely shouldn't link to the rejected one. http://www.growstuff.org/posts/shiny-20180404-indigenous-plants

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.