Fix download multiple files path #51444
                
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Summary
Hello, with the release 31.0.0 of nextcloud, we got a 404 error while downloading multiple files in a zip archive from a directory containing the ':' character in its name. It seems to be related to the function "downloadNodes". The url.pathname is computed using node.source and later it is used to compute the path of files that uses node.encodedSource.
When the ':' character is present in the string, this causes a wrong substring computation of the file name.
TODO
Checklist