Small fixes

Class statistics

• Moved the student amount limit field next to radio button when showing all courses (instead of specific curriculum)
• "Select study rights" notification changed to "Select studyprogramme"
• Fixed curriculum picker sort order

Custom population & Study guidance groups

• Fixed bugs in Courses of population -pane

Faculty view

• Fixed class size from undefined to correct on graduation stats

Studyprogramme overview

• Fixed some doctoral programmes showing Programme courses of wrong provider