payment url only for online payments ...

git-svn-id: https://plugins.svn.wordpress.org/events-made-easy/trunk@1013965 b8457f37-d9ea-0310-8a92-e5e31aec5664
release 1.5.9

git-svn-id: https://plugins.svn.wordpress.org/events-made-easy/trunk@1013966 b8457f37-d9ea-0310-8a92-e5e31aec5664