[FIX] purchase: qty updated

- Create a PO with 2 different product lines (A & B), confirm.
- Change quantity of B and save

The chatter message mentions A, while the quantity of B was changed.

opw-1849258

addons/purchase/views/purchase_template.xml

@@ -5,7 +5,7 @@
         <div>
             <strong>The ordered quantity has been updated.</strong>
             <ul>
-                <li><t t-esc="line.order_id.product_id.display_name"/>:</li>
+                <li><t t-esc="line.product_id.display_name"/>:</li>
                 Ordered Quantity: <t t-esc="line.product_qty" /> -&gt; <t t-esc="float(product_qty)"/><br/>
                 <t t-if='line.order_id.product_id.type in ("consu", "product")'>
                     Received Quantity: <t t-esc="line.qty_received" /><br/>