message: Fixed test in iOS wrapper
diff: NSError *ret = [[PoolUtils sharedInstance] openPoolLedger:poolName
  config:nil
  poolHandler:nil];
  - XCTAssertEqual(ret.code, CommonIOError, @"PoolUtils::openPoolLedger returned wrong code");
  + XCTAssertEqual(ret.code, PoolLedgerNotCreatedError, @"PoolUtils::openPoolLedger returned wrong code");
  [TestUtils cleanupStorage];
  }
  