Merge pull request #903 from edx/vkaracic/SOL-2033

[SOL-2033] Change voucher list to raw ID list in basket details admin page.

ecommerce/extensions/basket/admin.py

@@ -19,6 +19,7 @@ class PaymentProcessorResponseInline(admin.TabularInline):
 
 @admin.register(Basket)
 class BasketAdminExtended(BasketAdmin):
+    raw_id_fields = ('vouchers', )
     inlines = (LineInline, PaymentProcessorResponseInline,)
     show_full_result_count = False