message: Returned spends to pre-sigma state
diff: @@ -1248,22 +1248,8 @@ CAmount CWallet::GetDebit(const CTxIn &txin, const isminefilter &filter) const {
  LOCK(cs_wallet);
  if (txin.IsZerocoinSpend()) {
  - if (!(filter & ISMINE_SPENDABLE)) {
  + // Reverting it to its pre-Sigma state.
  goto end;
  - }
  -
  - CWalletDB db(strWalletFile);
  - std::unique_ptr<libzerocoin::CoinSpend> spend;
  -
  - try {
  - std::tie(spend, std::ignore) = ParseZerocoinSpend(txin);
  - } catch (CBadTxIn&) {
  - goto end;
  - }
  -
  - if (CZerocoinState::GetZerocoinState()->HasCoin(spend->getCoinSerialNumber())) {
  - return spend->getDenomination() * COIN;
  - }
  } else if (txin.IsSigmaSpend()) {
  if (!(filter & ISMINE_SPENDABLE)) {
  goto end;
  