[FIX] portal_sale: portals are not allowed to see payments

Portal users are not allowed to read account.move.line model
Therefore, in the portal, if you let the payments in the invoice view, the portal user is warned that he is not allowed to see account.move.line

addons/portal_sale/portal_sale_view.xml

@@ -24,6 +24,16 @@
                 </field>
         </record>
 
+        <record model="ir.ui.view" id="invoice_form_portal">
+            <field name="name">account.invoice.form.portal</field>
+            <field name="model">account.invoice</field>
+            <field name="inherit_id" ref="account.invoice_form"/>
+            <field name="groups_id" eval="[(4,ref('base.group_portal'))]"/>
+            <field name="arch" type="xml">
+                <field name="payment_ids" position="replace" />
+            </field>
+        </record>
+
         <record id="view_account_invoice_filter_share" model="ir.ui.view">
             <field name="name">account.invoice.select.share</field>
             <field name="model">account.invoice</field>