98systemd: fixup rootfs-generator installation path

The rootfs-generator was installed in the wrong path
in the initrd, cause it never to be run.

References: bnc#878714

Signed-off-by: Hannes Reinecke <hare@suse.de>

modules.d/98systemd/module-setup.sh

@@ -192,7 +192,7 @@ install() {
     inst_script "$moddir/dracut-mount.sh" /bin/dracut-mount
     inst_script "$moddir/dracut-pre-pivot.sh" /bin/dracut-pre-pivot
 
-    inst_script "$moddir/rootfs-generator.sh" /lib/systemd/system-generators/dracut-rootfs-generator
+    inst_script "$moddir/rootfs-generator.sh" $systemdutildir/system-generators/dracut-rootfs-generator
 
     inst_binary true
     ln_r $(type -P true) "/usr/bin/loginctl"