Never store battery stats for cache

In PowerUsageBase, it will store battery stats if it has a configuration
change, which will make BatteryStatsLoaderHelper never get the correct
battery stats because it uses Bundle.EMPTY as the bundle message.

This cl:
1. Remove the store action even though it is configuration change.
2. Always use null to get battery stats
3. Always start a battery status check in register()

Bug: 63658232
Test: RunSettingsRoboTests
Change-Id: Ifbf970c63378ed66dddcdae4d952b7d1fd84216a

src/com/android/settings/fuelgauge/PowerUsageBase.java

@@ -82,19 +82,6 @@ public abstract class PowerUsageBase extends DashboardFragment
         mBatteryBroadcastReceiver.unRegister();
     }
 
-    @Override
-    public void onStop() {
-        super.onStop();
-    }
-
-    @Override
-    public void onDestroy() {
-        super.onDestroy();
-        if (getActivity().isChangingConfigurations()) {
-            mStatsHelper.storeState();
-        }
-    }
-
     protected void restartBatteryStatsLoader() {
         getLoaderManager().restartLoader(0, Bundle.EMPTY, this);
     }
@@ -108,7 +95,7 @@ public abstract class PowerUsageBase extends DashboardFragment
     @Override
     public Loader<BatteryStatsHelper> onCreateLoader(int id,
             Bundle args) {
-        return new BatteryStatsHelperLoader(getContext(), args);
+        return new BatteryStatsHelperLoader(getContext());
     }
 
     @Override