message: Fix multiple data allocate for CWallet
diff: WalletTestingSetup::WalletTestingSetup(const std::string& chainName):
  TestingSetup(chainName)
  {
  - bool fFirstRun;
  - pwalletMain = new CWallet("wallet_test.dat");
  - pwalletMain->LoadWallet(fFirstRun);
  RegisterValidationInterface(pwalletMain);
  RegisterWalletRPCCommands(tableRPC);
  