Admin CSS updates

git-svn-id: https://plugins.svn.wordpress.org/visual-form-builder/trunk@814389 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update global form font size

git-svn-id: https://plugins.svn.wordpress.org/visual-form-builder/trunk@814391 b8457f37-d9ea-0310-8a92-e5e31aec5664