Fix blob download when the filename is "data"

Steps to reproduce:

1. create a File document and attach a file named "data" (just "data" without any extension)
2. after the file upload, observe that the preview is not correctly displayed
3. now click on the download button
4. observe that it displays an error message "Sorry, the page you requested cannot be found"

Expected behavior: the blob is correctly downloaded

Root cause analysis: the bug is caused by the decoding of the URL in https://github.com/nuxeo/nuxeo/blob/2023/modules/core/nuxeo-core-io/src/main/java/org/nuxeo/ecm/core/io/download/DownloadBlobInfo.java#L66-L67 where "file:content/data" matches a known property and therefore the xpath and filename variables are not correctly set, and the download service cannot retrieve the blob, hence the error.