Since the changing of assets (8cc066173d)
the /web/session/modules route returned a stringified set instead of a list
After this commit, the route returns a list
closes odoo/odoo#70545
X-original-commit: 54e4a48996826dd8ea16a84517b46a847d6daf3f
Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>