Fix compile error

Author: yrong

bridges/snowbridge/pallets/inbound-queue/src/lib.rs

@@ -48,7 +48,7 @@ use frame_support::{
 };
 use frame_system::ensure_signed;
 use scale_info::TypeInfo;
-use sp_core::H160;
+use sp_core::{H160,H256};
 use sp_runtime::traits::Zero;
 use sp_std::{convert::TryFrom, vec};
 use xcm::prelude::{