[FIX] invoice_xunnel: add file extension to datas
requested to merge vauxoo-dev/xunnel-account:14.0-add-file-extension-to-xml-downloaded-i314 into 14.0
- Added the
.xml
extension to the datas created by the wizard that downloads the invoices from the SAT, this was done to make it compatible with the workflow of all l10n_mx_* apps.