only show pin icon and overlay on storyform posts

git-svn-id: https://plugins.svn.wordpress.org/storyform/trunk@1052095 b8457f37-d9ea-0310-8a92-e5e31aec5664
Ability to always be storyform post on a/b tests

git-svn-id: https://plugins.svn.wordpress.org/storyform/trunk@1052097 b8457f37-d9ea-0310-8a92-e5e31aec5664