Fix subscriptions again

[UncleGoogle]

Fixes #139

In short: adjusting to changes JSON value in humble API response. I don't know why they change key name. Maybe I need more investigation for this "initial-classic" thing.

[UncleGoogle]

Idea: humble may want to distinguish product offers depending on subscription type. So since August 2020, instaed of "initial" license there are:

• initial-without-order - for not unlock month yet
• initial-classic
• initial-basic (?)
• initial-premium (?)
• initial-lite (?)

(?) - I need someone with appropriate subscription to confirm that. Basically go to https://www.humblebundle.com/api/v1/subscriptions/humble_monthly/subscription_products_with_gamekeys and check what is under "contentChoiceData".

[UncleGoogle]

Attaching build: fix.zip To install:

• remove previous build form %localappdata%\GOG.com\Galaxy\plugins\installed
• put there new build (so there is C:\Users\mesco\AppData\Local\GOG.com\Galaxy\plugins\installed\build (you can rename "build" if you want)