Use correct command to reload systemd config

Signed-off-by: Volker Theile <votdev@gmx.de>

deb/openmediavault/debian/openmediavault.postinst

@@ -128,7 +128,7 @@ case "$1" in
 			####################################################################
 			echo "Updating service units ..."
 			# Reload systemd unit files.
-			deb-systemd-helper daemon-reload || :
+			systemctl daemon-reload || :
 
 			# Stop and disable various services that are disabled by default.
 			deb-systemd-helper disable smartmontools.service