fixed icon url

git-svn-id: https://plugins.svn.wordpress.org/wp-url-shorten/trunk@1055239 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed icon url

git-svn-id: https://plugins.svn.wordpress.org/wp-url-shorten/trunk@1055240 b8457f37-d9ea-0310-8a92-e5e31aec5664