[FIX] models: check_company on res.users field
[FIX] models: check_company on res.users field

Before this commit, when a record of a model who has a `res.users` field
it could fail the `check_company` because the check looks for
`company_id` who is the default company of the user.
In the case of `res.users`, `check_company` must look after the
`company_ids` of the user.
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