[FIX] mrp: make done unbuild form readonly

Some added readonly attributes in the unbuild form view were overriding
the `states={'done': [('readonly', True)]}` attributes in the models'
fields. So we add the readonly when state='done' to the view as well.

Note that same issue exists in saas-12.3 and 13.0, but only for 2 of the
4 fields fixed in this commit (i.e. it probably isn't a big deal for
these older versions.)

Discovered during task: 2033341

closes odoo/odoo#63537

Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>

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