[FIX] fields: in `one2many.set`, replace incorrect query by ORM access

When linking a record into a `one2many` relation with command `(4, rid)`, a
query checks whether the record is already linked to the current record id:

    SELECT 1 FROM {inv_table} WHERE id={rid} AND {inv_field}={id}

where `inv_field` is the name of the inverse field, and `inv_table` is the
table where this field is stored.

The query is wrong if the inverse field is inherited, because the `rid` does
not belong to the table `inv_table`.

The test has been replaced by a plain ORM access:

    rec = obj.browse(cr, SUPERUSER_ID, rid)
    if int(rec[inv_field]) != id:
        ...

This fixes #4685.

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