Bug#921921: live-config: Buster Live LXQt does not autologin

[Alf Gaida <agaida@siduction.org>]

Hi Daniel,

given that only KDE and LXQt use sddm as DM the patch looks right.

Thanks for the link, the next builds in a few days will look much nicer
and more like an mature debian flavour. But yay, the first official
Debian LXQt live iso i've started :)

(pcmanfm-qt 0.14.0 should soon hit testing - same for lxqt-theme-debian
which will bring a proper theme with the right™ debian background, only
the metapackages need some adjustment right now)

Cheers Alf