Override androidx.startup.InitializationProvider authority name

The original InitializationProvider provider is defined in
prebuilts/sdk/current/androidx/manifests/
androidx.startup_startup-runtime/AndroidManifest.xml
which ends up getting merged with the app manifest.

This has the side effect of applying the wrong package name
in android:authorities and that prevents installation of the
official application from F-Droid.

Test: Install Etar from F-Droid along with our system app in place.
Change-Id: I36df9c5e4ef363efff4a4f2ae3fdbb98884f1abd