Use userId to query the package uid instead of 0.

The target package may not be always installed on the user 0. Since
getPacakgeUid would check the package installed state now, we should
use the valid userId to query the package uid.

Bug: 186180067
Test: atest -p services/core/java/com/android/server/am
Change-Id: Iaac8e56f3dcc97145d4c21fb092aac892fa59231