Fix cost for new subscriber in admin

costs/admin.py

@@ -35,7 +35,7 @@ class ServiceInline(admin.TabularInline):
     monthly_unit_cost.short_description = "Coût de revient mensuel"
 
     def new_subscriber_cost(self, obj):
-        return '{:.2f}€'.format(obj.get_prices()['total_goods_value_share'])
+        return '{:.2f}€'.format(obj.get_prices()['unit_goods_value_share'])
     new_subscriber_cost.short_description = "Coût nouv. abo"