Apply channel overrides for LSPS4 clients

Extended channel override configuration logic to apply to LSPS4
clients in addition to LSPS2 clients. This ensures LSPS4 clients
receive the same channel configuration overrides, including
maximum inbound HTLC value in flight settings and underpaying
HTLC claim allowances.

Author: amackillop

src/event.rs

@@ -1230,13 +1230,11 @@ where
 				let user_channel_id: u128 = rng().random();
 				let allow_0conf = self.config.trusted_peers_0conf.contains(&counterparty_node_id);
 				let mut channel_override_config = None;
-				if let Some((lsp_node_id, _)) = self
-					.liquidity_source
-					.as_ref()
-					.and_then(|ls| ls.as_ref().get_lsps2_lsp_details())
-				{
+				if let Some((lsp_node_id, _)) = self.liquidity_source.as_ref().and_then(|ls| {
+					ls.get_lsps2_lsp_details().or(ls.get_lsps4_lsp_details())
+				}) {
 					if lsp_node_id == counterparty_node_id {
-						// When we're an LSPS2 client, allow claiming underpaying HTLCs as the LSP will skim off some fee. We'll
+						// When we're an LSPS2/4 client, allow claiming underpaying HTLCs as the LSP will skim off some fee. We'll
 						// check that they don't take too much before claiming.
 						//
 						// We also set maximum allowed inbound HTLC value in flight