[REM] cooperator_api: jornal demo data

remove _api_external_id in journal demo data
This accounting data is not used in tests with demo data.
More information in
OCA/cooperative@1ff4edd

Co-authored-by: Gerard Funosas <gfunosas>

cooperator_api/demo/demo.xml

@@ -30,11 +30,6 @@
         <field name="external_id_generated" eval="True" />
     </record>
 
-    <record id="cooperator.subscription_journal" model="account.journal">
-        <field name="_api_external_id">1</field>
-        <field name="external_id_generated" eval="True" />
-    </record>
-
     <record id="cooperator.account_equity_demo" model="account.account">
         <field name="_api_external_id">1</field>
         <field name="external_id_generated" eval="True" />