Use startActivityAsUser instead of startActivity API to start the AppLocalePickerActivity of different users Bug: 274378136 Test: 1. Perform AppLocalePickerActivityTest robolectric test 2. Perform the manual test by switching different users 3. Perform the manual test by switching different profiles Change-Id: I4405b3b7e832b71b9ef66fa71d9e42ce12da167c