Fix adaptive brightness not appearing in Settings search

Change-Id: I33ed525b3c051a982869114754bd3b7423b61d22
Fixes: 117449384
Test: manual

src/com/android/settings/display/AutoBrightnessPreferenceController.java

@@ -52,7 +52,7 @@ public class AutoBrightnessPreferenceController extends TogglePreferenceControll
     public int getAvailabilityStatus() {
         return mContext.getResources().getBoolean(
                 com.android.internal.R.bool.config_automatic_brightness_available)
-                ? AVAILABLE_UNSEARCHABLE
+                ? AVAILABLE
                 : UNSUPPORTED_ON_DEVICE;
     }
 
@@ -67,4 +67,4 @@ public class AutoBrightnessPreferenceController extends TogglePreferenceControll
                 ? R.string.auto_brightness_summary_on
                 : R.string.auto_brightness_summary_off);
     }
-}
+}