Allow server settings before wallet restore

[skironDotNet]

Clicking Wallet -> Server Info won't bring settings for server URL when very first time start.

Work around 1: on very first start create dummy wallet, set wallet URL, stop, delete files ~/.zcash and then start and restore desired wallet.

Work around 2: edit ~/.config/Zecwallet\ Lite/settings.json to be {"all":{"lwd":{"serveruri":"https://my-desired-server.com:9067"}}}
start the app and restore desired wallet