[FIX] core: first onchange on new one2many line

Consider models `M` and `L`, with a one2many field `M.l_ids` with
inverse `L.m_id`.  Consider also a computed field `L.foo` that depends
on `L.m_id`.

The field `L.foo` is not computed correctly by `onchange` on a new line
in the form view of `M`: its value is forced to `False` because it has
no default, and is not recomputed by `onchange` since the field `L.m_id`
is never triggered an `onchange`.

Modify the method `onchange` to not force fields without a default to
`False`, and return all fields.

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