Sets autofetch to true on Student Module Progressions

Allows the first 10 to load, plus 500px past the viewport, then on
scroll gets another page.

fixes CNVS-14452

test plan:
	- Go to a course (in Firefox, because Chrome sends a scroll event
	  regardless)
	- Add 11+ modules to the course
	- Enroll 1 user in the course (as a student)
	- You should see the first ten load, then instantly the next
	  few with only a small delay.
	- If you've added 50+ you should see small delays as all the
	  modules load.

Change-Id: I040c00b8f0fdd5ff3b38d3fe7dbdb2d678567ce3