[FIX] sale_stock: Customer Reference field in Delivery Slip report

- Confirm a Sale Order with a Customer Reference ('client_order_ref'
field) set;
- Validate the Delivery Order;
- Print the Delivery Slip report;

The display area of the Customer Reference field is not correct on
the printed pdf report

opw-2260756

closes odoo/odoo#51701

X-original-commit: 4f3a9a59394cac425e23b81b3fe811a592c6dae2
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/sale_stock/report/stock_report_deliveryslip.xml

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <odoo>
     <template id="report_delivery_document_inherit_sale_stock" inherit_id="stock.report_delivery_document">
-        <xpath expr="//h2" position="before">
+        <xpath expr="//div[@name='div_sched_date']" position="after">
             <div class="row justify-content-end" t-if="o.sudo().sale_id.client_order_ref">
-                <div class="col-4">
+                <div class="col-auto">
                     <strong>Customer Reference:</strong>
                     <p t-field="o.sudo().sale_id.client_order_ref"/>
                 </div>