Make sure color schemes get the 1px white border around checkboxes on the media uploader. See #26147.

git-svn-id: https://develop.svn.wordpress.org/trunk@26311 602fd350-edb4-49c9-b593-d223f7449a82
Correct @return value for wp_credits(). props morganestes. fixes #26150.

git-svn-id: https://develop.svn.wordpress.org/trunk@26312 602fd350-edb4-49c9-b593-d223f7449a82