'On the Fly' Auto Thumbnailer using GD Library Version 2.4 fix 3

Change:
- Corrected a minor error in the included admin/categories.php

This, for convenience, is the complete contrib but if you've already downloaded 2.4 fix 2, you don't need this. You only need to go to admin/categories.php and find this line:
if (($HTTP_POST_VARS['delete_image'] == 'yes') {

Just delete the first bracket, leaving:
if ($HTTP_POST_VARS['delete_image'] == 'yes') {


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