Use real magnet link in download modal

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Previously, on clicking Magnet, we were redirecting to a different site:
https://download.kiwix.org/zim/other/xyzBookWithDate.zim.magnet

This had the real magnet link as page content
Now we use the real magnet link in the href, thus not redirecting and starting the download right away.
Fix #767

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f