Modals: Remove yet more cruft that was causing unwanted coloration of icons.

props celloexpressions.
fixes #29147 (for real this time).

Built from https://develop.svn.wordpress.org/trunk@29697


git-svn-id: http://core.svn.wordpress.org/trunk@29472 1a063a9b-81f0-0310-95a4-ce76da25c4cd