* Box shadow for screen options/help tabs focus state.
* Text shadow on the about screen badge to match the text shadow in the graphic itself.
* Border for credits screen gravatars, in place of the previous box shadow.
props nacin. see #23415.
git-svn-id: https://develop.svn.wordpress.org/trunk@23409 602fd350-edb4-49c9-b593-d223f7449a82