[16.0] stock_mts_mto_rule: company-specific products crash upgrade of module

[kevinkhao]

module affected: stock_mts_mto_rule

In an intercompany context, when a product is company-specific and uses mts+mto rule, upgrading the module raises this error:

File "/opt/odoo/odoo/models.py", line 3464, in _check_company
raise UserError("\n".join(lines))
odoo.exceptions.UserError: Incompatible companies on records:

• 'Make To Order + Make To Stock' belongs to company False and 'Products' (product_ids: 'San Francisco company-specific product') belongs to another company.

Steps to reproduce:

1. Install this module
2. Use MTS+MTO rule on a company-specific product
3. Upgrade the module

Expected behavior
No exception on module upgrade

Temporary fix/workaround can be found here #2126

[github-actions]

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