[FIX] rating: Wrong template style

What are the steps to reproduce your issue ?

    1. Go to helpdesk/configuration/stages
    2. Add rating email template to Solved
    3. Change state of a ticket to Solved
    4. Go to Technical/messages and open the sent message

What is currently happening ?

    The template is not displayed correctly

opw-2476485

closes odoo/odoo#70234

Signed-off-by: Achraf <abz-odoo@users.noreply.github.com>