[FIX] sale_stock: Printing Delivery Order

Steps to reproduce the bug:

- Create a user U with manager inventory access rights and no right in sales
- Create a SO and validate it, it will create a picking P
- Lock the SO
- Log with U and try to print the delivery slip of P

Bug:

A access right error was raised.

opw:1878504

addons/sale_stock/report/stock_report_deliveryslip.xml

@@ -2,10 +2,10 @@
 <odoo>
     <template id="report_delivery_document_inherit_sale_stock" inherit_id="stock.report_delivery_document">
         <xpath expr="//div[@name='customer_address']" position="after">
-            <div class="row" t-if="o.sale_id.client_order_ref">
+            <div class="row" t-if="o.sudo().sale_id.client_order_ref">
                 <div class="col-xs-4 pull-right">
                     <strong>Customer Reference:</strong>
-                    <p t-field="o.sale_id.client_order_ref"/>
+                    <p t-field="o.sudo().sale_id.client_order_ref"/>
                 </div>
             </div>
         </xpath>