Remove install of zfs-load-module.service for dracut

The zfs-load-module.service service is not currently provided by
the OpenZFS repository so we cannot safely assume it exists.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matthew Thode <mthode@mthode.org>
Closes #13574

contrib/dracut/90zfs/module-setup.sh.in

@@ -86,8 +86,7 @@ install() {
 
 		for _service in \
 			"zfs-import-scan.service" \
-			"zfs-import-cache.service" \
-			"zfs-load-module.service"; do
+			"zfs-import-cache.service"; do
 			inst_simple "${systemdsystemunitdir}/${_service}"
 			systemctl -q --root "${initdir}" add-wants zfs-import.target "${_service}"
 		done