Two restore sets created when setting up the app

[grote]

We call initializeTransportsForUser() after selecting new storage which is in line with the API docs.

However, when doing the first backup, the system forces us to do another initialization, because @pm@ has no data stored: https://cs.android.com/android/platform/superproject/main/+/main:frameworks/base/services/backup/java/com/android/server/backup/keyvalue/KeyValueBackupTask.java;l=627;drc=1e6cad07e738f3a7c2baf7639b45e043db892d3c