Adapt font whitelist to changes on macOS (zh locales)

https://bugzilla.mozilla.org/show_bug.cgi?id=1350766 wants to use Songti TC/SC for macOS as default fonts. We should check whether we need to update the related font whitelist.

(This is the ticket for https://lists.torproject.org/pipermail/tbb-dev/2017-September/000610.html)