Remove welcome_message from console.py
Remove welcome_message from console.py

It is not used anymore.
The console prints network.banner instead.

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