[FIX] l10n_generic_coa: fix demo invoice with wrong journal

The 'Miscellaneous Operations' journal was used instead of the 'Vendor
Bills' journal for that demo invoice, which lead to a crash when
processing it with the OCR.

closes odoo/odoo#37618

Signed-off-by: Laurent Smet <smetl@users.noreply.github.com>

addons/l10n_generic_coa/demo/account_invoice_demo.xml

@@ -64,7 +64,7 @@
 
         <!-- ==== Invoice Demo 6 - Draft Vendor Bill for OCR ==== -->
 
-        <record id="demo_invoice_extract" model="account.move" context="{'type': 'in_invoice'}">
+        <record id="demo_invoice_extract" model="account.move" context="{'default_type': 'in_invoice'}">
             <field name="type">in_invoice</field>
             <field name="invoice_user_id" ref="base.user_demo"/>
         </record>