Fix test location provider bug

LocationManager.isProviderEnabled should return true for a test provider if:
1. A test provider is added through LocationManager.addTestProvider
2. The test provider is enabled through LocationManager.setTestProviderEnabled

This fix changes the logic if LocationManager.isProviderEnabled and
LocationManager.setProviderEnabledForUser to allow users get/set test
location provider status.

Bug: 72647543
Bug: 77238940
Test: Manual
Test: run cts --module CtsLocationTestCases -t android.location.cts.LocationManagerTest
Change-Id: Ib241e5b487fd873c1fa0d7ac34b82b8592fc0906