[Wallet] keep HD seed during salvagewallet

src/wallet/wallet.cpp

@@ -3291,7 +3291,7 @@ bool CWallet::InitLoadWallet()
     if (fFirstRun)
     {
         // Create new keyUser and set as default key
-        if (GetBoolArg("-usehd", DEFAULT_USE_HD_WALLET)) {
+        if (GetBoolArg("-usehd", DEFAULT_USE_HD_WALLET) && walletInstance->hdChain.masterKeyID.IsNull()) {
             // generate a new master key
             CKey key;
             key.MakeNewKey(true);

src/wallet/walletdb.cpp

@@ -977,7 +977,7 @@ bool CWalletDB::Recover(CDBEnv& dbenv, const std::string& filename, bool fOnlyKe
                 fReadOK = ReadKeyValue(&dummyWallet, ssKey, ssValue,
                                         wss, strType, strErr);
             }
-            if (!IsKeyType(strType))
+            if (!IsKeyType(strType) && strType != "hdchain")
                 continue;
             if (!fReadOK)
             {