Follow-up: Inform user 5.12 is the preferred PyQt version in the error
Follow-up: Inform user 5.12 is the preferred PyQt version in the error

This is a follow-up to the previous #1516 PR.  We actually prefer the
user install 5.12+, so I updated the message to reflect this.

fyookball/electrum,fyookball/electrum,fyookball/electrum