Fix get all courses API
The get all courses API currently returns all courses of the current school year (e.g. 2019-2020. or 2020-2021). This means no courses are returned in the summer when no courses for {current year} - {current year +1} are uploaded but it is that school year. Instead, get all courses API should return all courses from the most recent school year for which courses exist.
Edited by Carson Cook (14CDWC)