fix #4100: spent_outpoints does not track everything
fix #4100: spent_outpoints does not track everything

kyuupichan/electrum,asfin/electrum,neocogent/electrum,wakiyamap/electrum-mona,spesmilo/electrum,kyuupichan/electrum,neocogent/electrum,pooler/electrum-ltc,pooler/electrum-ltc,neocogent/electrum,cryptapus/electrum,pooler/electrum-ltc,fujicoin/electrum-fjc,vialectrum/vialectrum,cryptapus/electrum,asfin/electrum,wakiyamap/electrum-mona,asfin/electrum,fujicoin/electrum-fjc,vialectrum/vialectrum,pooler/electrum-ltc,cryptapus/electrum,kyuupichan/electrum,spesmilo/electrum,spesmilo/electrum,wakiyamap/electrum-mona,vialectrum/vialectrum,spesmilo/electrum,fujicoin/electrum-fjc,wakiyamap/electrum-mona