Hide completion bar and completion menu option for teachers (or any non-tracked user)

Please test this issue both in Android and iOS. Login in mobilemaster as a student. In dashboard, check that you see a progress bar below some courses in the Course overview block. Open a course with progress (e.g. MM Dev Testing). Open the section selector. Check that you see a progress bar below some sections. Open All sections. Check that you see a progress bar below the section selector. Now login as a teacher. Repeat steps 2-5, but now you shouldn't see the progress bars. Now login in mobile35 as a teacher. In dashboard, check that you see a progress bar below some courses in the Course overview block. Open a course with progress (e.g. MM Dev Testing) and go to All sections. Check that you see a progress bar below the section selector.