message: Fix wrong category for Sigma mint in gettransaction RPC
diff: @@ -1379,7 +1379,7 @@ void ListTransactions(const CWalletTx& wtx, const string& strAccount, int nMinDe
  entry.push_back(Pair("involvesWatchonly", true));
  entry.push_back(Pair("account", strSentAccount));
  MaybePushAddress(entry, s.destination, addr);
  - if(wtx.IsZerocoinMint()) {
  + if (wtx.IsZerocoinMint() || wtx.IsZerocoinMintV3()) {
  entry.push_back(Pair("category", "mint"));
  }
  else if(wtx.IsZerocoinSpend()){
  