[FIX] pos_adyen: JS error in loop if deleted Adyen payment line

Before this commit:
 If we remove a payment line using an Adyen payment method,
 `pending_adyen_line()` return `undefined`.
 With the `_poll_for_response` still being executed,
 it will pop some JS traceback each call with:
 ```js
 TypeError: Cannot read properties of undefined (reading 'terminalServiceId')
 ```

After this commit:
 No JS traceback loop

OPW-3032391

closes odoo/odoo#106461

X-original-commit: 52a517ca
Signed-off-by: Quentin Lejeune (qle) <qle@odoo.com>

addons/pos_adyen/static/src/js/payment_adyen.js

@@ -212,7 +212,7 @@ var PaymentAdyen = PaymentInterface.extend({
         }).then(function (status) {
             var notification = status.latest_response;
             var order = self.pos.get_order();
-            var line = self.pending_adyen_line();
+            var line = self.pending_adyen_line() || resolve(false);
 
             if (notification && notification.SaleToPOIResponse.MessageHeader.ServiceID == line.terminalServiceId) {
                 var response = notification.SaleToPOIResponse.PaymentResponse.Response;