### Describe the issue

Testing in bitcoin 0.13.0, calling `bitcoin-cli listsinceblock x` is outputting all double-spent transactions that are in the wallet, even those that were double-spent well and truly before x.
### Is the issue reproducible?

Yes
#### List steps to reproduce below:
1.   Create a double-spend send to your wallet (easiest using bip125)
2.   Wait until one confirms, and then wait a few more blocks
3.   Run `bitcoin-cli listsinceblock $(bitcoin-cli getbestblockhash)` and it will output the double spent transaction
### Expected behavior

The double-spent transaction that was conflicted before the block hash should be filtered

{
    std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
    CWallet* const pwallet = wallet.get();
    if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
        return NullUniValue;
    }
            RPCHelpMan{"listreceivedbyaddress",
                "\nList balances by receiving address.\n",
                {
                    {"minconf", RPCArg::Type::NUM,  "1", "The minimum number of confirmations before payments are included."},
                    {"include_empty", RPCArg::Type::BOOL,  "false", "Whether to include addresses that haven't received any payments."},
                    {"include_watchonly", RPCArg::Type::BOOL,  "true for watch-only wallets, otherwise false", "Whether to include watch-only addresses (see 'importaddress')"},
                    {"address_filter", RPCArg::Type::STR, RPCArg::Optional::OMITTED_NAMED_ARG, "If present, only return information on this address."},
                },
                RPCResult{
            "[\n"
            "  {\n"
            "    \"involvesWatchonly\" : true,        (bool) Only returns true if imported addresses were involved in transaction.\n"
            "    \"address\" : \"receivingaddress\",  (string) The receiving address\n"
            "    \"amount\" : x.xxx,                  (numeric) The total amount in " + CURRENCY_UNIT + " received by the address\n"
            "    \"confirmations\" : n,               (numeric) The number of confirmations of the most recent transaction included\n"
            "    \"label\" : \"label\",               (string) The label of the receiving address. The default label is \"\".\n"
            "    \"txids\": [\n"