Currently, when someone adds a quiz on the slide content from front-end
and clicks on the 'Set Done' button, `werkzeug.exceptions.Forbidden`
error is raised which shows the full stack trace to the end user.
This commit improves the behavior by raising UserError instead and
thus displaying nice error instead of the full stack trace.
taskID-2380233
closesodoo/odoo#85694
X-original-commit: 5dfd5dd50fa8cd3f023ba7fa0c2fc4b52f9c5650
Signed-off-by: Warnon Aurélien (awa) <awa@odoo.com>