message: Fix wrong key getting
diff: @@ -209,7 +209,7 @@ contract C {
  const auto &accountId = getAccDetailQuery.accountId();
  // Since Burrow should always set a key, no need to check for
  // boost::optional emptiness
  - const std::string &key = *getAccDetailQuery.key();
  + const std::string key = getAccDetailQuery.key().value();
  // Check the requested account and detail exist
  const auto iterToTestAccount = testAccounts.find(accountId);
  