Fix COF membership test in loadkfetdevdata

cofprofile.is_cof don't exist anymore. The membership test should be performed
like `cofprofile.profile.user.has_perm("cof.member")`

kfet/management/commands/createopes.py

@@ -134,7 +134,7 @@ class Command(BaseCommand):
                 on_acc=account,
                 checkout=checkout,
                 at=at,
-                is_cof=account.profile.is_cof,
+                is_cof=account.profile.user.has_perm("cof.member"),
                 amount=amount,
             ))
             at_list.append(at)