Bad unfolding of List-Unsubscribe header

If you have a long "List-Unsubscribe" header folded on multiple lines, the "Unsubscription" page (e.g. https://aboutmy.email/xxx/unsubscribe) unfolds it incorrectly and keeps the white spaces used for folding in the URL it extracts (typically visible as "%20" when you copy the target URL) therefore making RFC 8058 tests fail.