Problem in uploading catalog images after upgrade to Magento 1.9.2.3

Here's a problem I've found when patching Magento CE with SUPEE-7405. It replaces the line:

chmod($destinationFile, 0777);

with:

chmod($destinationFile, 0640);

in the file lib/Varien/File/Uploader.php

This stopped my images displaying in the back end, 

since this file permission should actually be 644. Is there any reason this has been set to 640?