Fix restart unit condition on radosgw

This change just fixes the restart condition
for the radosgw file used when the certificate
is renewed.

Change-Id: Id3f76cd03c993d013090c7c764d6963a64a1c74f

files/certmonger-rgw-refresh.sh

@@ -4,6 +4,6 @@
 rgw_unit=$(systemctl list-unit-files | awk '/radosgw/ {print $1}')
 
 # Restart the rgw systemd unit
-if [ -z "$rgw_unit" ]; then
+if [ -n "$rgw_unit" ]; then
     systemctl restart "$rgw_unit"
 fi