Don't init batterystats in onCreate()

After ag/2573096, the batterystats will be refreshed after each
broadcastReceiver registeration. And this registeration happens
in onResume().

So we don't need to init batterystats in onCreate() anymore.

Bug: 65629008
Test: RunSettingsRoboTests
Change-Id: I4ed2d420c6f2bb77d726dac4dd58fa6704ce6929

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

@@ -60,8 +60,6 @@ public abstract class PowerUsageBase extends DashboardFragment
         mBatteryBroadcastReceiver.setBatteryChangedListener(() -> {
             restartBatteryStatsLoader();
         });
-
-        getLoaderManager().initLoader(0, icicle, this);
     }
 
     @Override