Enforce empty company on default account journal sequence

and do not explicitly set the default sequence to journal.

issue11553
review419281003

journal.xml

@@ -102,6 +102,7 @@ this repository contains the full copyright notices and license terms. -->
         <record model="ir.sequence" id="sequence_account_journal">
             <field name="name">Default Account Journal</field>
             <field name="sequence_type" ref="sequence_type_account_journal"/>
+            <field name="company" eval="None"/>
         </record>
 
         <record model="ir.ui.view" id="journal_period_view_form">