[IMP] point_of_sale: show date of order when reprint receipt

The order date was missing when using the reprint feature.

task-2492631

addons/point_of_sale/static/src/js/models.js

@@ -2834,6 +2834,7 @@ exports.Order = Backbone.Model.extend({
                 minute: date.getMinutes() ,
                 isostring: date.toISOString(),
                 localestring: this.formatted_validation_date,
+                validation_date: this.validation_date,
             },
             company:{
                 email: company.email,

addons/point_of_sale/static/src/xml/Screens/ReceiptScreen/OrderReceipt.xml

@@ -148,9 +148,13 @@
             <br/>
             <div class="pos-receipt-order-data">
                 <div><t t-esc="receipt.name" /></div>
-                <div><t t-esc="receipt.date.localestring" /></div>
+                <t t-if="receipt.date.localestring">
+                    <div><t t-esc="receipt.date.localestring" /></div>
+                </t>
+                <t t-else="">
+                    <div><t t-esc="receipt.date.validation_date" /></div>
+                </t>
             </div>
-
         </div>
     </t>
     <t t-name="OrderLinesReceipt" owl="1">