data: Wait for systemd-udev-settle.service

While technically deprecated, we really need to have the drm devices
resolved when we try to start GNOME Shell. This is the straight forward
way of ensuring that is the case.

It might be possible to be a bit smarter here by watching udev and
checking whether a DRM device is available for each seat.

Closes: #662
1 job for benzea/wait-for-udev in 4 minutes and 21 seconds (queued for 1 second)
Status Job ID Name Coverage
passed #1138107