kcms/nightcolor: Make Night Color enabled/disabled part of the combobox

Merged Bharadwaj Raju requested to merge work/bharadwaj/nightcolor-activated-in-checkbox into master

Makes the UI a little bit cleaner, and avoids a situation where in order to change Night Color mode you have to go through Automatic mode first as it's the default.

cc @teams/vdg

Edited by Bharadwaj Raju

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