Set color of update line to red if update is older than six hours.

In Data Usage screen, out-of-date state

Bug: 70950124

Test: manual
Test: make RunSettingsRoboTests
Change-Id: Icf6fafe9ab61a2c1ac3fba2bebf3bd4407c0ecfe

src/com/android/settings/datausage/DataUsageSummaryPreferenceController.java

@@ -219,7 +219,7 @@ public class DataUsageSummaryPreferenceController extends BasePreferenceControll
                     mCycleStart = rule.start.toEpochSecond() * 1000L;
                     mCycleEnd = rule.end.toEpochSecond() * 1000L;
                 }
-                mSnapshotTime = System.currentTimeMillis() - primaryPlan.getDataUsageTime();
+                mSnapshotTime = primaryPlan.getDataUsageTime();
             }
         }
         mManageSubscriptionIntent =