view: fix total on summary purchase.

tienda_ilusion/don_confiao/frontend/don-confiao/src/components/SummaryPurchase.vue

@@ -92,7 +92,7 @@
       calculateTotal(lines) {
         let total = 0;
         lines.forEach(line => {
-          total += this.calculateSubtotal(line.price, line.quantity);
+          total += this.calculateSubtotal(line.unit_price, line.quantity);
         });
         return total;
       }