f - Update LSPS2 BOLT12 tests for payment-only router

Keep exercising SCID-based InvoiceRequest interception while removing the now-unused message-router constructor wiring from the LSPS2 helper setup.

Co-Authored-By: HAL 9000

Author: tnull

lightning-liquidity/tests/lsps2_integration_tests.rs

@@ -19,7 +19,6 @@ use lightning::ln::msgs::OnionMessageHandler;
 use lightning::ln::types::ChannelId;
 use lightning::offers::invoice_request::InvoiceRequestFields;
 use lightning::offers::offer::OfferId;
-use lightning::onion_message::messenger::NullMessageRouter;
 use lightning::routing::router::{InFlightHtlcs, Route, RouteParameters, Router};
 use lightning::sign::{RandomBytes, ReceiveAuthKey};
 
@@ -1553,11 +1552,7 @@ fn bolt12_custom_router_uses_lsps2_intercept_scid() {
 	);
 
 	let inner_router = FailingRouter::new();
-	let router = LSPS2BOLT12Router::new(
-		inner_router,
-		NullMessageRouter {},
-		lsps_nodes.client_node.keys_manager,
-	);
+	let router = LSPS2BOLT12Router::new(inner_router, lsps_nodes.client_node.keys_manager);
 	router.register_intercept_scid(
 		intercept_scid,
 		LSPS2Bolt12InvoiceParameters {
@@ -1680,7 +1675,6 @@ fn bolt12_lsps2_end_to_end_test() {
 
 	let lsps2_router = Arc::new(LSPS2BOLT12Router::new(
 		FailingRouter::new(),
-		NullMessageRouter {},
 		Arc::new(RandomBytes::new([43; 32])),
 	));
 	lsps2_router.register_intercept_scid(
@@ -1962,7 +1956,6 @@ fn bolt12_lsps2_compact_message_path_test() {
 
 	let lsps2_router = Arc::new(LSPS2BOLT12Router::new(
 		FailingRouter::new(),
-		NullMessageRouter {},
 		Arc::new(RandomBytes::new([43; 32])),
 	));
 	lsps2_router.register_intercept_scid(