[FIX] invoice_xunnel: add file extension to datas

Olar Alca [Vauxoo]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.

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