Show the number of approved comments instead of all comments on
the dashboard in the "At a glance" section.

fixes #26738. props benjmay
Built from https://develop.svn.wordpress.org/trunk@29785


git-svn-id: http://core.svn.wordpress.org/trunk@29557 1a063a9b-81f0-0310-95a4-ce76da25c4cd