Fixed posts_where when user has all caps

git-svn-id: https://plugins.svn.wordpress.org/sk-post-type-access/trunk@934565 b8457f37-d9ea-0310-8a92-e5e31aec5664
tag 0.0.6 in trunk

git-svn-id: https://plugins.svn.wordpress.org/sk-post-type-access/trunk@934567 b8457f37-d9ea-0310-8a92-e5e31aec5664