interface: change close() implementation
interface: change close() implementation

was getting on lightning branch in some circumstances
RecursionError: maximum recursion depth exceeded while calling a Python object

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