Edition of block links has been broken several times.
This commit adds a test that makes sure it does not happen again by
changing the URL of a card of a mega menu with the Cards template.
task-3300977
closesodoo/odoo#121362
X-original-commit: b4b5816a4acd953eb4dabfd14d2a142934dee357
Signed-off-by: Vray Benjamin (bvr) <bvr@odoo.com>