Lock zins inside z_sendmany async operation

src/wallet/asyncrpcoperation_sendmany.h

@@ -112,6 +112,11 @@ private:
     bool main_impl();
 
     void sign_send_raw_transaction(UniValue obj);     // throws exception if there was an error
+
+    void lock_utxos();
+    void unlock_utxos();
+    void lock_notes();
+    void unlock_notes();
 };