DrupalPageBreak button not visible with Smart Paging module

This was a previous issue with this module where the DrupalPageBreak button is not visible even though the Smart Paging module ( https://www.drupal.org/project/smart_paging ) is active and is able to handle it.

I ran into the issue while I was editing my CKEditor profile to include the DrupalPageBreak Button for my content editors.

In the previous fix, the patch fixed the issue within the includes/ckeditor.lib.inc file.

But there is a code snippet within this file ckeditor.ckeditor.inc which unsets the button if the pagebreak or paging module are not active.

Since the Smart Paging module does handle this feature correctly and was already accepted by the module maintainer, the fix is to also include the smart_paging module as part of this check.