paperwork: Fix department_certifications shop lead check

parentheses are important! Also removed the superuser override, as
that was hiding the issue for my account

paperwork/views.py

@@ -57,11 +57,7 @@ class MemberCertificationListView(ListView):
 
 @login_required
 def department_certifications(request):
-    if request.user.is_superuser:
+    if (member := Member.from_user(request.user)) is not None:
-        departments = Department.objects.prefetch_related(
-            "shop_lead_flag__members"
-        ).all()
-    elif member := Member.from_user(request.user) is not None:
         departments = Department.objects.filter_by_shop_lead(member)
     else:
         departments = []