files: fix duplicate relabeling of preset file
files: fix duplicate relabeling of preset file

The relabelPath() in createUnits() is the correct call, since it also
handles the parent directory.  Move it into createSystemdPresetFile() for
clarity and delete the other one.

Fixes: 02896114c9 ("files: relabel the systemd preset directory")

coreos/ignition,coreos/ignition,coreos/ignition