Removed background color of crm enrich mail messages, so that they look good on both light and dark mode Related task: 3541419 closes odoo/odoo#158475 X-original-commit: 26c7b2408c248b9e81ee3c383c8cf076bbc9c552 Signed-off-by: Louis Baudoux (lba) <lba@odoo.com> Signed-off-by: Joris Makauskis (jmak) <jmak@odoo.com>