Remove optional from company agent

The type string is supposed to be followed by the company name.

modules/commission/view/agent_list.xml

@@ -2,9 +2,9 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
 <tree>
-    <field name="company" expand="1" optional="1"/>
     <field name="party" expand="1"/>
     <field name="type_"/>
+    <field name="company" expand="1"/>
     <field name="plan" expand="1" optional="0"/>
     <field name="pending_amount" optional="1"/>
 </tree>