[INP] portal_sale: remove buggy context

Even if this should never be used in normal portal environment, if a user with enough access rights tries to create an invoice, this would crash. We don't need context here (opw 612591).

addons/portal_sale/portal_sale_view.xml

@@ -64,7 +64,6 @@
             <field name="res_model">account.invoice</field>
             <field name="view_mode">tree,form</field>
             <field name="domain">[('type','in',['out_invoice','out_refund'])]</field>
-            <field name="context">{'type':['out_invoice','out_refund'], 'journal_type': 'sale'}</field>
             <field name="search_view_id" ref="account.view_account_invoice_filter"/>
             <field name="help">We haven't sent you any invoice.</field>
         </record>