Test: Change way to find app in TV launcher

UI res id has changed:
favorite_app_banner for app on Apps row
app_title for app on Apps view
Find app in Apps View in zigzag because the app name
appears only when it's focused.

Test: am instrument -w -r android.test.appsmoke/android.support.test.runner.AndroidJUnitRunner
Bug: 62885880
Change-Id: I877aff8d0deeee298474843e4c4d289f70e68aa6