Added the product name property in member reads

refs https://github.com/TryGhost/Team/issues/1141

- The goal is to retrieve the product name for canceled subscriptions
- The property is located at `member.subscriptions.price.product.name`
- We can't easily get the full product as products are retrieved using a join through `members_products`, and there is only a `members_products` row when the subscription is active

ghost/members-api/lib/services/member-bread.js

@@ -128,6 +128,7 @@ module.exports = class MemberBREADService {
             'stripeSubscriptions.customer',
             'stripeSubscriptions.stripePrice',
             'stripeSubscriptions.stripePrice.stripeProduct',
+            'stripeSubscriptions.stripePrice.stripeProduct.product',
             'products',
             'offerRedemptions'
         ];