Drop unnecessary LDKNode type alias completely

... now that we don't have any generic to hide, we can just use the
`Node` type directly.

bindings/ldk_node.udl

@@ -34,10 +34,10 @@ interface Builder {
 	[Throws=BuildError]
 	void set_listening_addresses(sequence<SocketAddress> listening_addresses);
 	[Throws=BuildError]
-	LDKNode build();
+	Node build();
 };
 
-interface LDKNode {
+interface Node {
 	[Throws=NodeError]
 	void start();
 	[Throws=NodeError]

src/uniffi_types.rs

@@ -11,7 +11,7 @@ use crate::UniffiCustomTypeConverter;
 
 use crate::error::Error;
 use crate::hex_utils;
-use crate::{Node, SocketAddress, UserChannelId};
+use crate::{SocketAddress, UserChannelId};
 
 use bitcoin::hashes::sha256::Hash as Sha256;
 use bitcoin::hashes::Hash;
@@ -23,10 +23,6 @@ use lightning_invoice::{Bolt11Invoice, SignedRawBolt11Invoice};
 use std::convert::TryInto;
 use std::str::FromStr;
 
-/// This type alias is required as Uniffi doesn't support generics, i.e., we can only expose the
-/// concretized types via this aliasing hack.
-pub type LDKNode = Node;
-
 impl UniffiCustomTypeConverter for PublicKey {
 	type Builtin = String;