Typo fixes

Corrected three typos in English app.json:
"integral" instead of "integrals" in tour description of rewards
"affected" instead of "effected" in Tavern description
"Habit is an open" instead of "Habit an open" in Remove Ads

Not sure if this qualifies for Contributor status, I'm mainly using this as a dry run to learn my way around GitHub! But for future reference, uid is 7f14ed62-5408-4e1b-be83-ada62d504931