Fix the error: locktime is always reset to zero when serialize the json data
Fix the error: locktime is always reset to zero when serialize the json data

The "lockTime" field in the json object was ignored due to the wrong attribute name "locktime" was called.
pooler/electrum-ltc,cryptapus/electrum,wakiyamap/electrum-mona,wakiyamap/electrum-mona,wakiyamap/electrum-mona,pooler/electrum-ltc,asfin/electrum,pooler/electrum-ltc,wakiyamap/electrum-mona,neocogent/electrum,kyuupichan/electrum,vialectrum/vialectrum,cryptapus/electrum,spesmilo/electrum,asfin/electrum,pooler/electrum-ltc,neocogent/electrum,neocogent/electrum,spesmilo/electrum,kyuupichan/electrum,spesmilo/electrum,fujicoin/electrum-fjc,fujicoin/electrum-fjc,vialectrum/vialectrum,kyuupichan/electrum,cryptapus/electrum,vialectrum/vialectrum,asfin/electrum,spesmilo/electrum,fujicoin/electrum-fjc