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