Fix api endpoint for list of points

[mikaelGusse]

Description

What?

Fix issue where api endpoint GET /courses//points/ was showing the same list as GET /courses//students/. Now endpoint GET /courses//points/ gives the user a list of all students in a course and their points in the course.

Why?

Allows for easier parsing of points for Aalto Grades.

How?

Changed which list is given to the listserializer

Fixes #1360

Testing

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[ihalaij1]

Wow!

Interesting find, I wonder if changing the points API to not be the same as the students API will cause issues for some users that currently use the API endpoint...