message: Fix multi index adding
diff: @@ -414,7 +414,7 @@ void SigmaWallet::DeleteUnconfirmedMint(SigmaMintId const &id)
  SigmaPublicKey pubKey(GeneratePrivateKey(mint.seedId), DefaultSigmaParams);
  auto index = GetSeedIndex(mint.seedId);
  - mintPool.emplace(pubKey, mint.seedId, index);
  + mintPool.insert(MintPoolEntry(pubKey, mint.seedId, index));
  SaveMintPool();
  if (!walletdb.EraseExodusMint(id)) {
  @@ -458,7 +458,7 @@ size_t SigmaWallet::FillMintPool()
  auto privKey = GeneratePrivateKey(seed);
  SigmaPublicKey pubKey(privKey, DefaultSigmaParams);
  - mintPool.emplace(pubKey, seedId, index);
  + mintPool.insert(MintPoolEntry(pubKey, seedId, index));
  generatedCoins++;
  }
  