IEH2 Hotfix

Added : While a hero is doing one-click challenge, now the hero icon shows up in the challenge-type tab Fixed : Knockback debuff's stun effect for 0.5 sec didn't work Fixed : Octobaddie Challenge Lv+100 was unintentionally unlocked without Mystic Arena level milestone Fixed : When you inactivate a hero that is currently in Challenge, now the challenge will abort Fixed : Epic Store Item [Easy Access [Challenge]] and [One-Click Challenge] didn't work properly Fixed : Other minor bugs/typos