Bug 1755 fixed : Needs single quotes in queries official plugins

Merge from trunk

git-svn-id: http://piwigo.org/svn/branches/2.1@6655 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_category.inc.php

@@ -431,7 +431,7 @@ SELECT id, permalink, 0 AS is_old
       {
         $query='
 UPDATE '.OLD_PERMALINKS_TABLE.' SET last_hit=NOW(), hit=hit+1
-  WHERE permalink="'.$permalinks[$i].'" AND cat_id='.$cat_id.'
+  WHERE permalink=\''.$permalinks[$i].'\' AND cat_id='.$cat_id.'
   LIMIT 1';
         pwg_query($query);
       }