dns hacks: dns via proxy: special-case "localhost" string
dns hacks: dns via proxy: special-case "localhost" string

fix https://github.com/spesmilo/electrum/issues/7546

spesmilo/electrum,wakiyamap/electrum-mona,spesmilo/electrum,pooler/electrum-ltc,wakiyamap/electrum-mona,wakiyamap/electrum-mona,pooler/electrum-ltc,spesmilo/electrum,spesmilo/electrum,pooler/electrum-ltc,wakiyamap/electrum-mona,pooler/electrum-ltc