[FIX] base: Add missing parent_id in res.partner form

Steps to reproduce:
- Install hr and base_address_city
- Edit an employee
- In private info, set a private address
- Open private address form from the employee form

Traceback because parent_id is undefined.

The base_address_city module override a part of res.partner
view form to change the city readonly modifier.
This override adds a domain in which appears parent_id,
but the field is not present in the view.

Related commit 526bfca3af

closes odoo/odoo#32172

Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

odoo/addons/base/views/res_partner_views.xml

@@ -414,6 +414,7 @@
                 <form string="Private Address Form">
                     <sheet>
                         <field name="type" invisible="1"/>
+                        <field name="parent_id" invisible="1"/>
                         <label for="name" class="oe_editonly"/>
                         <field name="name" required="0"/>
                         <group>