Fix expect message

Author: jkczyz

lightning/src/ln/channel.rs

@@ -6987,7 +6987,7 @@ where
 		let commitment_point = self
 			.holder_commitment_point
 			.current_point()
-			.expect("current should be set after receiving the initial commitment_signed");
+			.expect("current_point should be set for channels initiating splicing");
 		let (holder_commitment_tx, _) = self.context.validate_commitment_signed(
 			pending_splice_funding,
 			transaction_number,