portal_property_sheets: add a storage_id for the birthplace_address_property of a Person

It prevents the getter to fail if a Person object has been reached from a relation property

product/ERP5/bootstrap/erp5_property_sheets/PropertySheetTemplateItem/portal_property_sheets/Person/birthplace_address_property.xml

@@ -132,6 +132,10 @@
             <key> <string>portal_type</string> </key>
             <value> <string>Acquired Property</string> </value>
         </item>
+        <item>
+            <key> <string>storage_id</string> </key>
+            <value> <string>default_address</string> </value>
+        </item>
       </dictionary>
     </pickle>
   </record>