Fix the bug using wrong TimeUnit

It should use DAYS, not HOURS.

Change-Id: I26784822c86e58cad93d35b6772ea54af7efb8f5
Fixes: 78362305
Test: RunSettingsRoboTests

src/com/android/settings/fuelgauge/batterytip/AnomalyCleanupJobService.java

@@ -64,7 +64,7 @@ public class AnomalyCleanupJobService extends JobService {
         final BatteryTipPolicy policy = new BatteryTipPolicy(this);
         ThreadUtils.postOnBackgroundThread(() -> {
             batteryDatabaseManager.deleteAllAnomaliesBeforeTimeStamp(
-                    System.currentTimeMillis() - TimeUnit.HOURS.toMillis(
+                    System.currentTimeMillis() - TimeUnit.DAYS.toMillis(
                             policy.dataHistoryRetainDay));
             jobFinished(params, false /* wantsReschedule */);
         });