[IMP] event_sale: add "editable" on SO when removing event_sale

Previously, removing event_sale would keep the updated groups_id. We want to have a way to get rid of it, which is now by removing the module.

addons/event_sale/views/sale_order_views.xml

@@ -37,7 +37,15 @@
         </record>
 
         <!-- the presence of 'event user' makes the order lines non-editable -->
-        <record id="sale.view_order_form_editable_list" model="ir.ui.view">
+        <record id="view_order_form_inherit_event_sale_group_event_user" model="ir.ui.view">
+            <field name="name">sale.order.form.inherit.event_sale.group_event_user</field>
+            <field name="model">sale.order</field>
+            <field name="inherit_id" ref="sale.view_order_form"/>
             <field name="groups_id" eval="[(4, ref('event.group_event_user'))]"/>
+            <field name="arch" type="xml">
+                <xpath expr="//field[@name='order_line']/tree" position="attributes">
+                    <attribute name="editable"/>
+                </xpath>
+            </field>
         </record>
 </odoo>