Revert changes to classslist loading in commit 362f626816401578ae56fc452d531a157b439a4f
Revert changes to classslist loading in commit 362f626816401578ae56fc452d531a157b439a4f

Revert the changes made to classlist loading by going back to using
`/d2l/api/le/1.4/(orgUnitId)/classlist/`. There appears to be
permission issues for non-system administrators using
`/d2l/api/lp/1.4/enrollments/orgUnits/(orgUnitId)/users/`.

ucalgary/d2l-grades-export,ucalgary/d2l-grades-export