[FIX] hw_posbox_homepage: Fix odoo service restart in iot

after using the token to link a database to an iot box, the odoo service
 is not restarted and therefore no box is visible in the database.
Now we apply the odoo_restart() function regardless of the platform used

closes odoo/odoo#134829

Signed-off-by: Quentin Lejeune (qle) <qle@odoo.com>