wallet: don't write to disk when switching servers
wallet: don't write to disk when switching servers

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