Remove unused joinsplit variables

src/wallet/asyncrpcoperation_shieldcoinbase.h

@@ -74,9 +74,6 @@ private:
     CAmount fee_;
     PaymentAddress tozaddr_;
 
-    uint256 joinSplitPubKey_;
-    unsigned char joinSplitPrivKey_[crypto_sign_SECRETKEYBYTES];
-
     std::vector<ShieldCoinbaseUTXO> inputs_;
 
     TransactionBuilder builder_;
@@ -87,7 +84,6 @@ private:
     void sign_send_raw_transaction(UniValue obj);     // throws exception if there was an error
 
     void lock_utxos();
-
     void unlock_utxos();
 };