Fix KQS app launch through tapping

KeyboardQuickSwitchView only ever has 2 direct children, and all of the task views we're actually concerned with are in a scrollview. removing the extra index handling as this is being handled properly downstream.

Flag: LEGACY ENABLE_KEYBOARD_QUICK_SWITCH ENABLED
Fixes: 328692760
Fixes: 304518513
Test: opened KQS and tapped all tasks (6 + overview)
Change-Id: I4e919cce7f1ab55822f93d34c1533062a71aa879