Metrics: PayloadAttemptNumber should persist across attempts
We should only reset the PayloadAttemptNumber if the update succeeds, or we switch to a different payload. The old code has already checked for the payload id; and we should only delete this pref upon successful updates. Bug: 122841006 Test: unit tests pass Change-Id: I7743b721d2899ba59375f8465468cc0e2a9b3568
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