Only media grid (not modal) should show "Uploaded by" and "Uploaded to".

props wonderboymusic.
fixes #29482.

Built from https://develop.svn.wordpress.org/trunk@29683


git-svn-id: http://core.svn.wordpress.org/trunk@29458 1a063a9b-81f0-0310-95a4-ce76da25c4cd