Qt, Prefs dialog: Fix formatting on Fiat tab
Qt, Prefs dialog: Fix formatting on Fiat tab

Made the QCheckBoxes have a .text property so the text appears next to
the checkbox (previously they used a buddy label).

Also made them left aligned in the widget/column.

This is more consistent with the rest of the preferences dialog.

fyookball/electrum,fyookball/electrum,fyookball/electrum