When restrict, use uid inside AppInfo

Before this CL, we use packageManager to get uid for battery
restriction. However it may not be correct all the time.

For example, RestrictedAppDetails will be opened as main user
however inside we also show work profile apps, in this case
we can't get correct uid by only using normal API in PackageManager.

This CL change it to use uid from AppInfo, which is correct all
the time.

Bug: 79992590
Test: RunSettingsRoboTests
Change-Id: Id33a5f6409d6bace0d756e5ac06432acb8b2cf65