Fix failing testSlicedStateCountMetricNoReset am: 0a824b9a90

Original change: https://android-review.googlesource.com/c/platform/packages/modules/StatsD/+/2393675

Change-Id: I94e461ca32108182787c3afb655ab5e38ff4dec0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>