Restrict ChannelInfo::as_directed_from visibility

Bindings can't handle references in return types, so reduce the
visibility to pub(crate).

Author: jkczyz

lightning/src/routing/network_graph.rs

@@ -700,7 +700,7 @@ impl ChannelInfo {
 
 	/// Returns a [`DirectedChannelInfo`] for the channel directed from the given `source` to a
 	/// returned `target`, or `None` if `source` is not one of the channel's counterparties.
-	pub fn as_directed_from(&self, source: &NodeId) -> Option<(DirectedChannelInfo, &NodeId)> {
+	pub(crate) fn as_directed_from(&self, source: &NodeId) -> Option<(DirectedChannelInfo, &NodeId)> {
 		let (direction, target) = {
 			if source == &self.node_one {
 				(self.one_to_two.as_ref(), &self.node_two)