Fix: Ignore SCIDs when creating full-length blinded paths

Previously, the `compact_paths` flag was only used to determine whether to
use a compact introduction node when creating compact blinded paths.

With the upcoming change to accept `MessageForwardNode` in
`create_blinded_paths`, there's a risk of SCIDs being passed (and used)
even when the user intends to create a full-length blinded path.

This patch updates the logic in `create_blinded_paths_from_iter` to
ignore SCIDs unless `compact_paths` is explicitly true—preserving correct
behavior for full-length blinded paths.

Author: shaavan

lightning/src/onion_message/messenger.rs

@@ -569,6 +569,10 @@ where
 
 		let has_one_peer = peers.len() == 1;
 		let mut peer_info = peers
+			.map(|peer| MessageForwardNode {
+				node_id: peer.node_id,
+				short_channel_id: if compact_paths { peer.short_channel_id } else { None },
+			})
 			// Limit to peers with announced channels unless the recipient is unannounced.
 			.filter_map(|peer| {
 				network_graph