Add keyword open on income statement view

issue5174
review17671002

view/account_income_statement_tree.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- 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 string="Income Statement">
+<tree string="Income Statement" keyword_open="1">
     <field name="name"/>
     <field name="amount"/>
 </tree>