Add company to tree view

It is needed because client validation enforce parent company through domain
inversion of the group.

issue11611
review417591003

view/account_type_tree.xml

@@ -3,4 +3,5 @@
 this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="name" expand="1"/>
+    <field name="company" optional="1"/>
 </tree>