make post highlights activation compatible with multisite installs


git-svn-id: https://plugins.svn.wordpress.org/post-highlights/trunk@1003981 b8457f37-d9ea-0310-8a92-e5e31aec5664
replace spaces with tabs


git-svn-id: https://plugins.svn.wordpress.org/post-highlights/trunk@1003985 b8457f37-d9ea-0310-8a92-e5e31aec5664