Hearthstone IOS app updating every time i open it

[Joachim-22234]

This is part of the Known Issues now so they are working on a fix:

@GnomeSayin-11972

[Added 6/21] [General] The team is investigating reports of some players being prompted to repeatedly download an update each time they open the client. In the meantime, it appears that a full reinstall should resolve the issue.