Update low battery level for advance bluetooth device

Bug: 154569936
Test: build pass
Change-Id: I52bb8eea4f69ae55a6902e3afb862aa8c7319785
diff --git a/src/com/android/settings/bluetooth/AdvancedBluetoothDetailsHeaderController.java b/src/com/android/settings/bluetooth/AdvancedBluetoothDetailsHeaderController.java
index 4742192..a063327 100644
--- a/src/com/android/settings/bluetooth/AdvancedBluetoothDetailsHeaderController.java
+++ b/src/com/android/settings/bluetooth/AdvancedBluetoothDetailsHeaderController.java
@@ -62,7 +62,7 @@
 public class AdvancedBluetoothDetailsHeaderController extends BasePreferenceController implements
         LifecycleObserver, OnStart, OnStop, OnDestroy, CachedBluetoothDevice.Callback {
     private static final String TAG = "AdvancedBtHeaderCtrl";
-    private static final int LOW_BATTERY_LEVEL = 20;
+    private static final int LOW_BATTERY_LEVEL = 15;
 
     @VisibleForTesting
     LayoutPreference mLayoutPreference;