ensure consistent header comment naming conventions

- BITCOIN_FOLDER_SUBFOLDER_FILENAME_H

src/wallet/walletdb.h

@@ -3,8 +3,8 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#ifndef BITCOIN_WALLETDB_H
-#define BITCOIN_WALLETDB_H
+#ifndef BITCOIN_WALLET_WALLETDB_H
+#define BITCOIN_WALLET_WALLETDB_H
 
 #include "amount.h"
 #include "wallet/db.h"
@@ -140,4 +140,4 @@ private:
 bool BackupWallet(const CWallet& wallet, const std::string& strDest);
 void ThreadFlushWalletDB(const std::string& strFile);
 
-#endif // BITCOIN_WALLETDB_H
+#endif // BITCOIN_WALLET_WALLETDB_H