Use the right class to extend SocietyDetailView

Ghost Userrequested to merge
sversteeg-master-patch-04102 into master

Closes #900 (closed)

Previous behaviour

Steps to reproduce:

  1. Go to the societies page
  2. They all don't have members

New behaviour

Steps to validate that it works:

  1. Go to the societies page
  2. They have the correct members
Edited by Ghost User

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