Use runuser command instead of su in init.d script (the runuser command is part of the util-linux package and always available)

Signed-off-by: DL6ER <dl6er@dl6er.de>

advanced/pihole-FTL.initd

@@ -36,7 +36,7 @@ start() {
     chmod 0644 /var/log/pihole-FTL.log /run/pihole-FTL.pid /run/pihole-FTL.port /var/log/pihole.log
     setcap CAP_NET_BIND_SERVICE,CAP_NET_RAW,CAP_NET_ADMIN+eip "$(which pihole-FTL)"
     echo "nameserver 127.0.0.1" | /sbin/resolvconf -a lo.piholeFTL
-    su -s /bin/sh -c "/usr/bin/pihole-FTL" "$FTLUSER"
+    runuser -u "$FTLUSER" "/usr/bin/pihole-FTL"
     echo
   fi
 }