Change getProductIds to getSubscriptionIds
Change getProductIds to getSubscriptionIds

In previous commit we changed feature to track user's subscriptions
(which granted access) instead of subscription types (products). This
method wasn't renamed.

remp/analytika#11

remp2020/remp,remp2020/remp,remp2020/remp,remp2020/remp,remp2020/remp