Protected file shows as being protected by an Assignment incorrectly

[brianhogg]

Reproduction Steps

1. Upload a file to a course or page using the File block
2. Protect the file using the Lock icon to a course
3. Go to the Media library and click on the file to view the properties

Expected Behavior

Shows as protected to students in the course/membership

Actual Behavior

States it is protected as an assignment submission. It does show the correct course/membership when you click on the lock icon again in the WP editor though.