Don't require login for blog pagination (bug #700218)

The script to return blogposts in views must be public so that
logged out users with permission to see the view can scroll
through the pages of posts.

Change-Id: I46a5bee3c59267c9bd357987253f35236a2a234e
Signed-off-by: Richard Mansfield <richard.mansfield@catalyst.net.nz>

htdocs/artefact/blog/posts.json.php

@@ -26,6 +26,7 @@
  */
 
 define('INTERNAL', 1);
+define('PUBLIC', 1);
 define('JSON', 1);
 
 require(dirname(dirname(dirname(__FILE__))) . '/init.php');