Make sure visited style computation color-scheme matches unvisited style.
Plumb it via the StyleBuilder like we do for the writing_mode for the
same reasons.
Differential Revision: https://phabricator.services.mozilla.com/D222328
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1917703
gecko-commit: 67633c2f0a9c228f5c93b815a753fdc45d3024f0
gecko-reviewers: dshin