[fix] problem in web client not supporting graph view in one2many

bzr revid: nicolas.vanhoren@openerp.com-20111005093237-22dbe1jwbkqk18pt

addons/idea/idea_view.xml

@@ -233,11 +233,7 @@
                         <field name="count_comments" />
                         <field name="count_votes" />
                     </group>
-                    <field name="stat_vote_ids" colspan="4" mode="graph,tree" nolabel="1">
-                        <graph string="Votes Statistics" type="bar">
-                            <field name="score"/>
-                            <field name="nbr"/>
-                        </graph>
+                    <field name="stat_vote_ids" colspan="4" mode="tree" nolabel="1">
                         <tree string="Votes Statistics">
                             <field name="score"/>
                             <field name="nbr"/>