[FIX] base: correct Model Overview report
[FIX] base: correct Model Overview report

Since 3d04e448, the reports must start with a `article` class, not `page`.
The report was not adapted.

Fixes #20066

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo