This change restores About page tab heights and fixes bugs with the tab bottom border caused by [44905] and [45243]. Reviewed by SergeyBiryukov and desrosj. Props ixkaito, ianbelanger, afercia, SergeyBiryukov. See #46901. Fixes #47075. Built from https://develop.svn.wordpress.org/trunk@45276 git-svn-id: http://core.svn.wordpress.org/trunk@45085 1a063a9b-81f0-0310-95a4-ce76da25c4cd