Don't update the standby bucket for apps that were just restored.

This prevents an app's bucket from being lowered due to a timeout if the
app hasn't been used since it was restored.

Bug: 214580000
Test: atest UsageStatsDatabaseTest
Test: manually verify buckets are restored
Change-Id: I1df310afabf2abde7bf91daab0142114bf244ec8
(cherry picked from commit d1fb46c6)