updated css for left nav icon for wordpress 2.8

git-svn-id: https://plugins.svn.wordpress.org/rj-quickcharts/trunk@821949 b8457f37-d9ea-0310-8a92-e5e31aec5664
and by 2.8, i mean 3.8

git-svn-id: https://plugins.svn.wordpress.org/rj-quickcharts/trunk@821960 b8457f37-d9ea-0310-8a92-e5e31aec5664