[FIX] base: make partner.company_type properly writeable

In 7eab8e26d3d46c53f4be924d6a34e80a66e74960 res.partner was converted
to the new API, at that point company_type was changed from a stored
field manually synchronised with is_company (through create/write
overrides) into a proper computed field.

However to make it "editable" it was simply marked as
"readonly=False", which means even though UI-wise it looks editable
editing it does not actually do anything (things work in the partners
form because there's also an onchange which updates is_company on the
fly).

Fix by implementing an inverse function and actually do this
correctly.

Fixes #20623

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