f - fix non-deterministic payment_id check

Author: jkczyz

lightning/src/ln/offers_tests.rs

@@ -1369,6 +1369,8 @@ fn fails_authentication_when_handling_invoice_for_refund() {
 	assert_eq!(invoice, expected_invoice);
 
 	expect_recent_payment!(david, RecentPaymentDetails::AwaitingInvoice, payment_id);
+	david.node.abandon_payment(payment_id);
+	get_event!(david, Event::InvoiceRequestFailed);
 
 	// Send the invoice to David using an invalid blinded path.
 	let invalid_path = refund.paths().first().unwrap().clone();