Administration: Fix remove links color.

Fix regression introduced in [48332] where the specificity
of the admin scheme link colors was higher than the remove link colors.

Props afercia.
Fixes #50536.

Built from https://develop.svn.wordpress.org/trunk@48376


git-svn-id: https://core.svn.wordpress.org/trunk@48145 1a063a9b-81f0-0310-95a4-ce76da25c4cd