Pass desktop name to DrKonqi
Allows DrKonqi to look up the application's service for e.g. proper cgroup scoping of the restarted app.
DrKonqi ignores any unknown arguments for compatibility should one run newer KCrash against old DrKonqi .
The crash handler says to not allocate any memory but it has been doing QGuiApplication::platformName()
in here forever, so I assume doing QGuiApplication::instance()->desktopFileName() is fine, too.