Gadget-DarkToggle.css

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body.skin-minerva #toggleContainer::after {
	display: none !important;
}
body.skin-minerva #footer-places-desktop-toggle::after {
	content: '•' !important;
}

@media (prefers-color-scheme: dark) {
	#toggleContainer, body.skin-minerva #footer-places-desktop-toggle::after {
		display: none !important;
	}
}

MediaWiki:Gadget-DarkToggle.css