[FIX] sale_stock: prevent displaying vendor's info in DO

Steps to reproduce:
- Activate Dropship and multi routes
- Create a SO and select the route Dropship
- Confirm the SO
- Confirm the purchase
- Click on Customer Preview

Issue:
In the customer preview, if the customer click on the do, vendor's info will be displayed.

opw-2961884

closes odoo/odoo#102020

X-original-commit: 672a3edce29bd1e16de64c4bcc8452842d3e16d4
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>
Signed-off-by: Yolann Sabaux (yosa) <yosa@odoo.com>

addons/sale_stock/views/sale_stock_portal_template.xml

@@ -12,12 +12,13 @@
             </div>
         </xpath>
         <xpath expr="//div[@id='informations']" position="inside">
-            <t t-if="sale_order.picking_ids">
+            <t t-set="delivery_orders" t-value="sale_order.picking_ids.filtered(lambda picking: picking.picking_type_id.code == 'outgoing')"/>
+            <t t-if="delivery_orders">
                 <div>
                     <strong>Delivery Orders</strong>
                 </div>
                 <div>
-                    <t t-foreach="sale_order.picking_ids.filtered(lambda picking: picking.picking_type_id.code == 'outgoing')" t-as="picking">
+                    <t t-foreach="delivery_orders" t-as="picking">
                         <t t-set="delivery_report_url"
                            t-value="'/my/picking/pdf/%s?%s' % (picking.id, keep_query())"/>
                         <div name="delivery_order"