Revert "For mozcentral use Firefox color theme instead of system theme." since -moz-toolbar-prefers-color-scheme
was removed
#14155
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Reverts #13314, see https://groups.google.com/g/firefox-dev/c/vajhbYKDpPM
Given that
-moz-toolbar-prefers-color-scheme
was removed in https://bugzilla.mozilla.org/show_bug.cgi?id=1736038, unless we fix this before the next PDF.js update in mozilla-central we'll thus break dark mode in the Firefox built-in PDF Viewer.