Remove download option for PEPPOL .xml

<!-- Before posting please check our "Troubleshooting" category in the docs: --> Setup • Version: 5.13.14 • Environment: Other Interface • Flutter: [] • React: [X] • Both: [] Checklist • Can you replicate the issue on our v5 demo site or No • Have you searched existing issues? Yes • Have you reported this to Slack/forum before posting? • Have you inspected the logs in storage/logs/laravel.log for any errors? No Describe the bug The Peppol integration is expected to submit document to a Peppol access point. Despite of that, am UBL document is made downloadable as XML, but this file is not valid. In the sections of AccountingSupplierParty and AccountingCustomerParty if uses hardcoded EndpointID schemeID="0037" referring to Finnish LY-tunnus regardless of what register the parties are listed in. Steps To Reproduce Send a Peppol invoice, access the eInvoice tab and download the file. Expected Beha…