multi: increase test coverage payments

The BOLT spec was updated and now requires the payment address for
the writer and reader. We increase the test coverage for payments
setting a wrong payment address.

itest/list_on_test.go

@@ -683,6 +683,10 @@ var allTestCases = []*lntest.TestCase{
 		Name:     "invoice migration",
 		TestFunc: testInvoiceMigration,
 	},
+	{
+		Name:     "payment address mismatch",
+		TestFunc: testWrongPaymentAddr,
+	},
 	{
 		Name:     "fee replacement",
 		TestFunc: testFeeReplacement,