Add installerSource to packageSetting earlier

This change updates the installerSource field of PackageSetting as part
of commitReconciledPackage instead of updateSettings. This ensures that
the package setting is more complete when added to AppsFilter.

Test: atest AppEnumerationTests
Fixes: 159939562
Change-Id: I62f09391078d9c1b774899b99eb188f7e3f410f1