fix bug when many of the same project are showing up on homepage

Author: VeryBigSad

projects/managers.py

@@ -52,7 +52,7 @@ def get_user_projects_for_list_view(self):
                 queryset=CustomUser.objects.only("id").all(),
             ),
             Prefetch("collaborator_set"),
-        )
+        ).distinct()
 
     def get_projects_for_detail_view(self):
         return (