fix(email-plugin): Add currency code in mock email confirmation (#1448)

packages/email-plugin/src/mock-events.ts

@@ -1,6 +1,7 @@
 import { AdjustmentType } from '@vendure/common/lib/generated-shop-types';
 import {
     AccountRegistrationEvent,
+    CurrencyCode,
     Customer,
     IdentifierChangeRequestEvent,
     NativeAuthenticationMethod,
@@ -20,6 +21,7 @@ export const mockOrderStateTransitionEvent = new OrderStateTransitionEvent(
     {} as any,
     new Order({
         id: '6',
+        currencyCode: CurrencyCode.USD,
         createdAt: '2018-10-31T11:18:29.261Z',
         updatedAt: '2018-10-31T15:24:17.000Z',
         orderPlacedAt: '2018-10-31T13:54:17.000Z',