fixup: Service now receives a fn as param client_has_open_channels.

To prevent passing the whole channel_manager (we only need 1 thing from it)
we now pass an fn as param to the service to check if an LSP has
opened channels with a client

Author: martinsaposnic

Diff for: lightning-liquidity/src/manager.rs

@@ -186,9 +186,26 @@ where {
 				{
 					supported_protocols.push(number);
 				}
+
+				let client_has_open_channels = {
+					let mut usable_channels = new_hash_map();
+					let channels = channel_manager.get_cm().list_channels();
+					for channel in channels.iter() {
+						if channel.is_usable {
+							usable_channels.insert(channel.counterparty.node_id, true);
+						}
+					}
+
+					let usable_channels_arc = Arc::new(usable_channels);
+					Box::new(move |client_node_id: &PublicKey| -> bool {
+						usable_channels_arc.contains_key(client_node_id)
+					}) as Box<dyn Fn(&PublicKey) -> bool + Send + Sync>
+				};
+
 				LSPS5ServiceHandler::new(
 					Arc::clone(&pending_events),
 					Arc::clone(&pending_messages),
+					client_has_open_channels,
 					config.clone(),
 				)
 			})