periodic/daily/480.leapfile-ntpd: only attempt to refresh leap-seconds.list

when ntpd is enabled.

The leap-seconds.list is used exclusively by ntpd, therefore, do not bother
to perform the fetch when ntpd is not enabled.

PR:		conf/275419
Reviewed by:	cy, michaelo, imp
Differential Revision: https://reviews.freebsd.org/D42875

(cherry picked from commit 3b3195f6767b39eb33b3523134ef988931c9c86d)
(cherry picked from commit 3ef596c6e80562710da09c16558d7351749ea143)

Security:       FreeBSD-EN-24:01.tzdata
Approved by:    so (gordon)

usr.sbin/periodic/etc/daily/480.leapfile-ntpd

@@ -12,9 +12,9 @@ fi
 
 case "$daily_ntpd_leapfile_enable" in
     [Yy][Ee][Ss])
-	if service ntpd oneneedfetch; then
+	if service ntpd enabled && service ntpd needfetch; then
 	    anticongestion
-	    service ntpd onefetch
+	    service ntpd fetch
 	fi
 	;;
 esac