[FIX] website_slides: latest courses should display all my courses
[FIX] website_slides: latest courses should display all my courses

Correctly fetch courses the current user is a member of, not those he already
finished at least a lesson.

Commit linked to task ID 1941250 and PR #31512.
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo