[FIX] guest_house: fix confirming a sale order that caused an error

closes #959

X-original-commit: cb3cdb7
Signed-off-by: Thibault Francois <[email protected]>

Author: arthurrrm

guest_house/demo/sale_order_post.xml

@@ -5,9 +5,6 @@
             ref('sale_order_1'),
             ref('sale_order_2'),
             ref('sale_order_3'),
-            ref('sale_order_4'),
-            ref('sale_order_5'),
-            ref('sale_order_6'),
         ]"/>
     </function>
     <record id="pickup_wizard_1" model="rental.order.wizard">
@@ -38,4 +35,11 @@
             ref('pickup_wizard_3'),
         ]"/>
     </function>
+    <function name="action_confirm" model="sale.order">
+        <value eval="[
+            ref('sale_order_4'),
+            ref('sale_order_5'),
+            ref('sale_order_6'),
+        ]"/>
+    </function>
 </odoo>