ver 3.9 remove option when unistall

git-svn-id: https://plugins.svn.wordpress.org/custom-field-snippet/trunk@781149 b8457f37-d9ea-0310-8a92-e5e31aec5664
ver 3.9 remove option when unistall

git-svn-id: https://plugins.svn.wordpress.org/custom-field-snippet/trunk@781150 b8457f37-d9ea-0310-8a92-e5e31aec5664