[Qt] Fixed esoteric bug where frozen PayToEdit w/ dark theme was bad
[Qt] Fixed esoteric bug where frozen PayToEdit w/ dark theme was bad

It set the background to "None" which reverted dark theme to a "white"
background (UI default).  This meant it was white on white text.  This
is wrong.

We redid the styles to be less bad.

fyookball/electrum,fyookball/electrum,fyookball/electrum