allow shorter than 24 word old 2fa seeds
allow shorter than 24 word old 2fa seeds

related: #3611

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