Back up Night Light settings

Bug: 30150787
Change-Id: I79697b41b68e0f123de20e7b8782c6058bef7977
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 765a3a8..3eb2ac3 100755
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -6380,7 +6380,11 @@
             PREFERRED_TTY_MODE,
             ENHANCED_VOICE_PRIVACY_ENABLED,
             TTY_MODE_ENABLED,
-            INCALL_POWER_BUTTON_BEHAVIOR
+            INCALL_POWER_BUTTON_BEHAVIOR,
+            NIGHT_DISPLAY_CUSTOM_START_TIME,
+            NIGHT_DISPLAY_CUSTOM_END_TIME,
+            NIGHT_DISPLAY_AUTO_MODE,
+            NIGHT_DISPLAY_ACTIVATED
         };
 
         /**