[FIX] stock: avoid non-deterministic order for location

Stock.location is ordered by "complete_name" which is possible to be the
same (i.e. default production locations for different companies). This
may result non-deterministic order. Add "id" to avoid it.

closes odoo/odoo#79135

Signed-off-by: William Henrotin (whe) <whe@odoo.com>