delete_all method of rcube_contacts has extraneous code

[sj26]

Changeset [1126] introduced a method to rcube_contacts called delete_all. This currently had some extraneous code which causes notices in php error logs:

    if (is_array($ids))
      $ids = join(',', $ids);

Variable $ids does not exit.

This appears to be because the delete_all methods was copied from the delete method which had this variable as a parameter and uses it in the SQL query.

[alec]

Fixed in r1387. Thanks.