Change wifi sleep policy

Keep wifi sleep policy as never when charged as long as
user has not changed the settings

Bug: 3038345
Change-Id: I37548984698dd3dd407785544d7b418439ed95d0
diff --git a/src/com/android/settings/wifi/AdvancedSettings.java b/src/com/android/settings/wifi/AdvancedSettings.java
index 1968eb0..74948f0 100644
--- a/src/com/android/settings/wifi/AdvancedSettings.java
+++ b/src/com/android/settings/wifi/AdvancedSettings.java
@@ -66,7 +66,8 @@
         ListPreference pref = (ListPreference) findPreference(KEY_SLEEP_POLICY);
         pref.setOnPreferenceChangeListener(this);
         int value = Settings.System.getInt(getContentResolver(),
-                Settings.System.WIFI_SLEEP_POLICY, Settings.System.WIFI_SLEEP_POLICY_DEFAULT);
+                Settings.System.WIFI_SLEEP_POLICY,
+                Settings.System.WIFI_SLEEP_POLICY_NEVER_WHILE_PLUGGED);
         pref.setValue(String.valueOf(value));
 
         pref = (ListPreference) findPreference(KEY_FREQUENCY_BAND);