Persistence preset: 'Night Light' settings

It would be useful to persistently set the ‘Night Light’ feature through the Dotfiles persistence mechanism. Testing indicates that settings for this are not saved to the .config/monitors.xml file, which is where I expected to find it. I couldn’t find any evidence of the setting being saved after examination of likely other hidden config files.

Unless this is a fingerprinting risk?

Related issues

Related to #5979

Original created by @kdr4 on 17239 (Redmine)

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