Remove unused header inclusion

src/wallet/asyncrpcoperation_mergetoaddress.h

@@ -1,6 +1,5 @@
 // Copyright (c) 2017 The Zcash developers
 // Copyright (c) 2016-2024 The Hush developers
-
 // Distributed under the GPLv3 software license, see the accompanying
 // file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
 
@@ -28,12 +27,9 @@
 #include "transaction_builder.h"
 #include "wallet.h"
 #include "zcash/Address.hpp"
-#include "zcash/JoinSplit.hpp"
-
 #include <array>
 #include <tuple>
 #include <unordered_map>
-
 #include <univalue.h>
 
 // Default transaction fee if caller does not specify one.