[FIX] repair: din5008 repair printing tracebak

This commit fix a traceback when printing the repair quotation
using the DIN 5008 repair module.
The field updated was not the correct one

task id : 3178931

closes odoo/odoo#115454

X-original-commit: 008cd881abcc9856de8bd7a7a8a5382fc31dc272
Signed-off-by: Arnold Moyaux (arm) <arm@odoo.com>

addons/l10n_din5008_repair/models/repair.py

@@ -22,6 +22,6 @@ class RepairOrder(models.Model):
     def _compute_l10n_din5008_document_title(self):
         for record in self:
             if record.state == 'draft':
-                record.l10n_de_document_title = _("Repair Quotation")
+                record.l10n_din5008_document_title = _("Repair Quotation")
             else:
-                record.l10n_de_document_title = _("Repair Order")
+                record.l10n_din5008_document_title = _("Repair Order")