[FIX] tests: wait reply for Page.stopLoading event
[FIX] tests: wait reply for Page.stopLoading event

closes odoo/odoo#35813

Signed-off-by: Xavier Dollé (xdo) <a1a56fd5af677733fcc9fce69c49c5e66d550efa@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo