[openstreetmap/openstreetmap-website] Add kilometers/miles switch to directions (PR #5915)

[Marwin Hochfelsner]

@hlfan commented on this pull request.



>      URL.revokeObjectURL(downloadURL);
     downloadURL = URL.createObjectURL(blob);
+    $("#directions_route_download").prop("href", downloadURL);

If you have the DOM anyway you can drop `downloadURL`

```suggestion
    URL.revokeObjectURL(downloadLink.href);
    downloadLink.href = URL.createObjectURL(blob);
```

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