closes LF-328
flag=media_links_use_attachment_id
Test plan:
1. In the files area in a course (or user)
2. Open the preview for a video file
(upload one if needed).
3. Try to upload a CC via the CC menu and
check that the correct media_attachments/
route was used and not media_objects/
Change-Id: I55e1c2fffe44de089c39b5eb96c4ba634198d242
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/319253
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Mysti Lilla <mysti@instructure.com>
QA-Review: Mysti Lilla <mysti@instructure.com>
Product-Review: Luis Oliveira <luis.oliveira@instructure.com>
Matheus