[FIX] account: rule error when creating an invoice from the Documents app

Steps to reproduce:
- Install Odoo with demo data, multiple companies and multiple users
- Go to Documents app
- Finance workspace
- Select a demo pdf
- Create invoice
- Error because of 'Mail Compose Message Rule'

The fix removes a non-necessary line when creating an invoice from a pdf

closes odoo/odoo#109032

X-original-commit: e5b60e6af030374972b36cb3cb61a38109da78e7
Signed-off-by: Nicolas Viseur (vin) <vin@odoo.com>

addons/account/models/account_journal.py

@@ -708,7 +708,6 @@ class AccountJournal(models.Model):
         invoices = self.env['account.move']
         with invoices._disable_discount_precision():
             for attachment in attachments:
-                attachment.write({'res_model': 'mail.compose.message'})
                 decoders = self.env['account.move']._get_create_document_from_attachment_decoders()
                 invoice = False
                 for decoder in sorted(decoders, key=lambda d: d[0]):