fixed default options

git-svn-id: https://plugins.svn.wordpress.org/seo-image/trunk@1056215 b8457f37-d9ea-0310-8a92-e5e31aec5664
enabled true

git-svn-id: https://plugins.svn.wordpress.org/seo-image/trunk@1056220 b8457f37-d9ea-0310-8a92-e5e31aec5664