run: Ignore system bus failures in parental controls check

Currently if the parental controls check can't connect to the system
bus, apps are not allowed to run. However, apps are also allowed to run
if the malcontent (or accounts-service) D-Bus services aren't available.
Since it's trivial to meet that requirement by starting a temporary
dbus-daemon and setting `DBUS_SYSTEM_BUS_ADDRESS` to use it, not being
able to access the system bus at all is no less secure.

This primarily affects flatpak running in a container where D-Bus is
generally not available.

Fixes: #5076
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f