[FIX] point_of_sale: Correctly update rewards after scanning a product

Current behavior:
When scanning a product that should trigger a reward, the reward was not
applied.

Steps to reproduce:
- Create a reward that applies a 10% discount on specific products
  (e.g. Whiteboard pen)
- Make sure a barcode is set on the Whiteboard pen product
- Open a PoS, and scan the Whiteboard pen product barcode
- The reward is not applied

opw-3373435

closes odoo/odoo#129406

X-original-commit: 9991d923ec0e7fc74e5d319d43a0052e6e4d7416
Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>
Signed-off-by: Robin Engels (roen) <roen@odoo.com>

addons/pos_loyalty/static/src/overrides/components/product_screen/product_screen.js

@@ -107,4 +107,8 @@ patch(ProductScreen.prototype, "pos_loyalty.ProductScreen", {
             selectedLine.order._updateRewards();
         }
     },
+    async _barcodeProductAction(code) {
+        await this._super(code);
+        this.currentOrder._updateRewards();
+    },
 });