Unbreak Qt apps without QT_QPA_PLATFORM
Well known but i don't think we have a bug:
Currenty Qt 5 apps like electrum start but don't display anything using the (default) xcb backend. Installing qtwayland5
and setting QT_QPA_PLATFORM=wayland
as we do in librem5-base works around this but causes trouble for other distros that use phoc since they can't just flip on the toggle. It also leads to numeres reports on the web where people have trouble stargting apps under 'phosh'.
This is more problematic with phoc being used more for desktop mode.