More safe search - since the default is one, toggle only works after

an initial xconfig is set - the first one will turn safe search on
(ie, do nothing from a users point of view).  Fix that.

include/dir_fns.php

@@ -25,7 +25,7 @@ function dir_safe_mode(&$a) {
 	
 	if ($observer)
 		$safe_mode = get_xconfig($observer,'directory','safe_mode');		
-	if($safe_mode == 0)
+	if($safe_mode === '0')
 		$toggle = t('Enable Safe Search');
 	else
 		$toggle = t('Disable Safe Search');