bug#48692: busctl call fails on elogind 243.7

[Andrew Tropin]

I try to use busctl to control the brightness of my screen:

$ busctl call org.freedesktop.login1 /org/freedesktop/login1/session/auto 
org.freedesktop.login1.Session SetBrightness "ssu" "backlight" 
"intel_backlight" 24242
Call failed: Connection timed out

It worked once, but at the same reported connection timed out, after
that it doesn't work and report the same connection timed out message.
After restart the situtation repeats.

I tried to build Guix System with elogind 246.10, the issue with busctl
is gone and it works fine without timed out message any number of times.