Fix indentation

Author: jurvis

bindings/ldk_node.udl

@@ -52,7 +52,7 @@ interface Node {
 	Invoice receive_variable_amount_payment([ByRef]string description, u32 expiry_secs);
 	PaymentDetails? payment([ByRef]PaymentHash payment_hash);
 	sequence<PeerDetails> list_peers();
-    sequence<ChannelDetails> list_channels();
+	sequence<ChannelDetails> list_channels();
 };
 
 [Error]