Remove staff debug category type whitelist.

Show the 'Staff debug' button on all blocks, including custom xblocks.

Staff debug was only available on selected components for historical reasons,
because it used to be much more intrusive.

lms/templates/staff_problem_info.html

@@ -6,7 +6,6 @@ from django.template.defaultfilters import escapejs
 
 ## The JS for this is defined in xqa_interface.html
 ${block_content}
-%if location.category in ['problem','video','html','combinedopenended','graphical_slider_tool', 'library_content']:
 %  if edit_link:
   <div>
       <a href="${edit_link}">Edit</a>
@@ -142,5 +141,3 @@ $(function () {
     );
 });
 </script>
-%endif
-