Making the light theme work with the day_night toggle feature

[mbvgua]

Raising this issue in accordance with issue #131 and PR #134

The light theme seems to work elegantly when set on the filter option, but set on the day_night option like so, no changes are reflected:

    day_night = {
	enable = true, -- turn off by default
	day_filter = "light", -- classic | octagon | pro | machine | ristretto | spectrum
	night_filter = "classic", -- classic | octagon | pro | machine | ristretto | spectrum
},

I cant find this in the docs and am unsure how to integrate this as Id like it to be a bit dynamic.