Add more columns in the theme browser on screens over 2000px wide to ensure that theme screenshots never appear larger than their resolution allows. Fixes #26172, props shaunandrews.


Built from https://develop.svn.wordpress.org/trunk@26633


git-svn-id: http://core.svn.wordpress.org/trunk@26523 1a063a9b-81f0-0310-95a4-ce76da25c4cd