fix: double encoding (#2393)

Co-authored-by: Zhouhui Tian <125243011+zhouhuitian@users.noreply.github.com>
Co-authored-by: Kai <7630809+Kailai-Wang@users.noreply.github.com>

Author: 3 people

tee-worker/sidechain/rpc-handler/src/direct_top_pool_api.rs

@@ -132,7 +132,7 @@ where
 				Ok(Ok(response)) => {
 					let json_value = RpcReturnValue {
 						do_watch: false,
-						value: response.encode(),
+						value: response,
 						status: DirectRequestStatus::Ok,
 					};
 					Ok(json!(json_value.to_hex()))