[IMP] purchase: Remove create and edit option from 'supplier currency' field.

We are able to create a currency on the fly. A user should not be able to
create a currency when entering master data, currency should only be added
through the currencies menu item and a part of configuration.

addons/purchase/partner_view.xml

@@ -9,7 +9,7 @@
             <field name="groups_id" eval="[(4, ref('base.group_multi_currency'))]"/>
             <field name="arch" type="xml">
                 <group name="purchase" position="inside">
-                    <field name="property_purchase_currency_id"/>
+                    <field name="property_purchase_currency_id" options="{'no_create': True, 'no_open': True}"/>
                 </group>
             </field>
     </record>