qt swap dialog: attempt at clearer logic (at the cost of more lines)
qt swap dialog: attempt at clearer logic (at the cost of more lines)

fixes #6853

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