The digest currently includes a CSS variable for the company's
secondary color, but Outlook does not support it.
This commit replaces the CSS variable in the digest with the QWEB
variable. Apart from that, if the secondary colour of the company
is available, it sets it into the colour property header of the
"mass_mailing_kpi_link_trackers" in email marketing and revert the
changes in commit[1] because border-start/end is an invalid property in CSS.
commit[1] - odoo-dev@1fcd098#diff-faee7192e5f6cf07658d2ceae16380c4b5d54035ecfb9bb4848608db3f429c69L263
tast-2717426
Part-of: odoo/odoo#89549
Mahamadasif Ansari
9b016e828f