In #103423 _load_records_write and _load_records_create
both bypass the self.user_has_groups('stock.group_stock_user')
check in _is_inventory_mode which makes some tests fail in 15+
To solve the problem we set inventory_mode to True
- Task id: 3007499

closes odoo/odoo#105160

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