overlay: Hide the option to show battery percentage

* The option is available in Status bar settings,
   as per our additions. Remove duplicate to improve UX.

Change-Id: I60a737617f192f5f0699ce50cfc3edc52c862492

overlay/common/frameworks/base/core/res/res/values/config.xml

@@ -92,4 +92,7 @@
 
     <!-- Whether or not swipe up gesture's opt-in setting is available on this device -->
     <bool name="config_swipe_up_gesture_setting_available">true</bool>
+
+    <!-- Whether or not we should show the option to show battery percentage -->
+    <bool name="config_battery_percentage_setting_available">false</bool>
 </resources>