Revert "fix: header html tag for `monobackgroundcolor` + `monoforegroundcolor` option"#12489

cscheid merged 1 commit intomainquarto-dev/quarto-cli:mainfrom

revert-6969-fix/mono-color-optionsquarto-dev/quarto-cli:revert-6969-fix/mono-color-optionsCopy head branch name to clipboard