Incorrect var passed to filter causing URL not getting wrapped in a link tag

git-svn-id: https://plugins.svn.wordpress.org/post-by-email-links/trunk@854811 b8457f37-d9ea-0310-8a92-e5e31aec5664
Version bump

git-svn-id: https://plugins.svn.wordpress.org/post-by-email-links/trunk@854813 b8457f37-d9ea-0310-8a92-e5e31aec5664