SAK-24180

Cleanup constant usage.



git-svn-id: https://source.sakaiproject.org/svn/basiclti/branches/BLTI-230@131370 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-24180

Finish the TODO for capabilities double-check



git-svn-id: https://source.sakaiproject.org/svn/basiclti/branches/BLTI-230@131372 66ffb92e-73f9-0310-93c1-f5514f145a0a