Correctly check updatability of columns targeted by INSERT...DEFAULT.

If a view has some updatable and some non-updatable columns, we failed
to verify updatability of any columns for which an INSERT or UPDATE
on the view explicitly specifies a DEFAULT item (unless the view has
a declared default for that column, which is rare anyway, and one
would almost certainly not write one for a non-updatable column).
This would lead to an unexpected "attribute number N not found in
view targetlist" error rather than the intended error.

Per bug #18546 from Alexander Lakhin.  This bug is old, so back-patch
to all supported branches.

Discussion: https://postgr.es/m/18546-84a292e759a9361d@postgresql.org

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