Fix the time flicker in battery settings page

Don't clear the text when reciever has been re-registered in
onResume(), where quickUpdate has been called.

Change-Id: Ie056dfb225a1bf6c224932b310a97499fc26e8f0
Fixes: 69312991
Test: RunSettingsRoboTests

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

@@ -135,9 +135,5 @@ public class BatteryHeaderPreferenceController extends BasePreferenceController
         mBatteryMeterView.setCharging(!discharging);
         mBatteryMeterView.setPowerSave(mPowerManager.isPowerSaveMode());
         mBatteryPercentText.setText(Utils.formatPercentage(batteryLevel));
-
-        // clear all the summaries
-        mSummary1.setText("");
-        mSummary2.setText("");
     }
 }