[FIX] web_editor: set style for selected color combination

Part of https://github.com/odoo/odoo/pull/69857


task-2431484

closes odoo/odoo#73562

X-original-commit: 6e6adad730956c6ddceb1f2461a0eb341edf7433
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>
Co-authored-by: qsm-odoo <qsm@odoo.com>