Disable NightDisplaySettingsActivity when not available

Not every device supports "Night Light" so this change disables the
NightDisplaySettingsActivity entry point using the system internal
R.bool.config_nightDisplayAvailable value.

Fixes: 30919608
Test: adb shell am start -a android.settings.NIGHT_DISPLAY_SETTINGS
Change-Id: I202c93069daaea08a0d754dd2f6b3de8c249c361
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 316f105..d83ac19 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -961,6 +961,7 @@
 
         <activity android:name="Settings$NightDisplaySettingsActivity"
                 android:label="@string/night_display_title"
+                android:enabled="@*android:bool/config_nightDisplayAvailable"
                 android:icon="@drawable/ic_settings_night_display"
                 android:taskAffinity="">
             <intent-filter android:priority="1">