Fix another menu highlight bug caused by not taking into account the default post type for edit.php and post-new.php. 

When "Pages -> Add New" was moved to the top level, clicking it would highlight "Posts -> Add New" instead. That's fixed now.

git-svn-id: https://plugins.svn.wordpress.org/admin-menu-editor/trunk@952706 b8457f37-d9ea-0310-8a92-e5e31aec5664