fix setMode which prevented user preferences from being set

[ollema]

nothing to add here, now it works :)

will close #15

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Latest commit: 1133236

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mode-watcher	Patch

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[ollema]

wait, this might have other problems though, maybe we are adding some classes twice now. have to test more, think about this and maybe update this patch.

what we are trying to avoid is not setting the modeUsersPrefers by short circuiting with the if statement, so I removed the if statement. now I'm worried that calling setActiveMode could add dark to the classList twice. looking at the MDN docs it seems like classList.add might not allow duplicate classes so maybe this concern is moot

[huntabyte]

Nice catch!