[FIX] delivery: delivery slip hs code

The variable that was setting the has_hs_code is set in the array
'stock_move_table' which has a t-if on the state to check it's not done,
so if the state is done, the variable is no set and hs_code never shown.

So we've put the variable in the begining of the report.

closes odoo/odoo#36902

Signed-off-by: pimodoo <pimodoo@users.noreply.github.com>

addons/delivery/views/report_deliveryslip.xml

@@ -15,10 +15,10 @@
                 <strong>Tracking Number:</strong>
                 <p t-field="o.carrier_tracking_ref"/>
             </div>
+            <t t-set="has_hs_code" t-value="o.move_lines.filtered(lambda l: l.product_id.hs_code)"/>
         </xpath>
 
         <xpath expr="//table[@name='stock_move_table']/thead/tr" position="inside">
-            <t t-set="has_hs_code" t-value="o.move_lines.filtered(lambda l: l.product_id.hs_code)"/>
             <th t-if="has_hs_code"><strong>HS Code</strong></th>
         </xpath>