[FIX] l10n_sa_edi: fix wrong edi content returned

The `_l10n_sa_get_invoice_content_edi` function is used to download the
edi_content of an edi_document when this edi_document is in error. This
function should return the xml encoded as a bytes, as it is then encoded
in base64 in account_edi/models/account_edi_document.py otherwise a

closes odoo/odoo#131837

Typeerror: "a bytes-like object is required, not 'dict'" is raised.
X-original-commit: 8bf1d6e0abdd41211045d23a512be5269a7d1b0c
Signed-off-by: Josse Colpaert <jco@odoo.com>
Signed-off-by: Julien Van Roy (juvr) <juvr@odoo.com>

addons/l10n_sa_edi/models/account_edi_format.py

@@ -455,9 +455,7 @@ class AccountEdiFormat(models.Model):
             Return contents of the submitted UBL file or generate it if the invoice has not been submitted yet
         """
         doc = invoice.edi_document_ids.filtered(lambda d: d.edi_format_id.code == 'sa_zatca' and d.state == 'sent')
-        if doc is not None and doc.attachment_id.datas:
-            return {invoice: {'xml_file': doc.attachment_id.datas.decode()}}
-        return {invoice: {'xml_file': self._l10n_sa_generate_zatca_template(invoice)}}
+        return doc.attachment_id.raw or self._l10n_sa_generate_zatca_template(invoice).encode()
 
     def _get_move_applicability(self, move):
         # EXTENDS account_edi