Links on about:tor are not clickable anymore on Windows starting with 8.5a5

Since the fix for #27111 (moved) landed links on about:tor are not clickable anymore on Windows systems. In particular git bisect points to 61deb44d0c07eb1ec1d71eac2f0a7aeca87ea054.

Thanks to a cypherpunk who brought this up on our blog: https://blog.torproject.org/comment/278901#comment-278901.

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