[MERGE] [FIX] idea: remove filter on many2many field

bzr revid: mat@openerp.com-20130621144108-1ehuk2elr5a81i73

addons/idea/idea_view.xml

@@ -114,7 +114,6 @@
                 <field name="category_ids"/>
                 <group expand="0" string="Group By...">
                     <filter icon="terp-personal" string="Creator" help="By Creators" context="{'group_by':'create_uid'}"/>
-                    <filter icon="terp-stock_symbol-selection" string="Category" help="By Idea Category" context="{'group_by':'category_ids'}"/>
                     <filter icon="terp-stock_effects-object-colorize" string="Status" help="By States" context="{'group_by':'state'}"/>
                 </group>
             </search>