Don't avoid retrying a blinded path if failure came from the wrong node.

Without this check, a forwarding node not on the blinded path could error with
INVALID_ONION_BLINDING and cause us to unnecessarily ban a blinded path from
future payment retries.

Author: valentinewallace

lightning/src/ln/outbound_payment.rs

@@ -1653,7 +1653,9 @@ impl OutboundPayments {
 				// next-hop is needlessly blaming us!
 				payment.get_mut().insert_previously_failed_scid(scid);
 			}
-			if onion_error_code == Some(INVALID_ONION_BLINDING) {
+			if onion_error_code == Some(INVALID_ONION_BLINDING) &&
+				node_id == path.hops.last().map(|h| h.pubkey)
+			{
 				debug_assert!(short_channel_id.is_none());
 				if let Some(bt) = &path.blinded_tail {
 					payment.get_mut().insert_previously_failed_blinded_path(&bt);