### 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

{
                    {"minconf", RPCArg::Type::NUM,  "1", "The minimum number of confirmations before payments are included."},
                    {"include_empty", RPCArg::Type::BOOL,  "false", "Whether to include labels 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')"},
                },
                RPCResult{
            "[\n"
            "  {\n"
            "    \"involvesWatchonly\" : true,   (bool) Only returns true if imported addresses were involved in transaction.\n"
            "    \"amount\" : x.xxx,             (numeric) The total amount received by addresses with this label\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"
            "  }\n"
            "  ,...\n"
            "]\n"
                },
                RPCExamples{
                    HelpExampleCli("listreceivedbylabel", "")
            + HelpExampleCli("listreceivedbylabel", "6 true")
            + HelpExampleRpc("listreceivedbylabel", "6, true, true")
                },
            }.Check(request);
    
    
    pwallet->BlockUntilSyncedToCurrentChain();
    auto locked_chain = pwallet->chain().lock();
    LOCK(pwallet->cs_wallet);
    return ListReceived(*locked_chain, pwallet, request.params, true);
}
static void MaybePushAddress(UniValue & entry, const CTxDestination &dest)