now syncprov wants lastmod on (ITS#4632)

tests/data/slapd-syncrepl-slave-persist-ldap.conf

@@ -43,6 +43,11 @@ suffix		"dc=example,dc=com"
 rootdn		"cn=Whoever"
 uri		@URI2@
 
+# ITS#4632: syncprov now wants this on (ITS#4613); however, since checks 
+# are in place to prevent lastmod operational attrs to be added twice,
+# this shuld make no harm
+lastmod		on
+
 # HACK: use the RootDN of the monitor database as UpdateDN so ACLs apply
 # whithout the need to write the UpdateDN before starting replication
 acl-bind	bindmethod=simple