Statsd_test update for rounding up alarms

In ag/3580546 we now round up when setting anomaly alarms. This means
the test needs to be updated by 1s in one place.

Test: make statsd_test && adb sync data && adb shell data/nativetest64/statsd_test/statsd_test
Change-Id: Ibd3548833dcc2c1b9ca3a1da2c183bb771799775