[IMP] name group_by_cooperator_type and filter def consistency

easy_my_coop/views/res_partner_view.xml

@@ -87,13 +87,13 @@
             <field name="model">res.partner</field>
             <field name="inherit_id" ref="base.view_res_partner_filter"/>
             <field name="arch" type="xml">
-            	<xpath expr="//filter[@name='supplier']" position='after'>
+            	<filter name="supplier" position='after'>
                    <filter string="Cooperators" name="cooperators" domain="[('member','=',1)]" help="Cooperator Partners"/>
                    <filter string="Old Cooperators" name="old_cooperators" domain="[('old_member','=',1)]" help="Cooperator Partners"/>
                    <filter string="Cooperator Candidates" name="cooperator_candidates" domain="[('coop_candidate','=',1)]" help="Cooperator Partners"/>
-                </xpath>
+                </filter>
                 <filter name="salesperson" position="before">
-                	<filter name="Cooperator Type" context="{'group_by': 'cooperator_type'}"/>
+                	<filter string="Cooperator Type" name="group_by_cooperator_type" context="{'group_by': 'cooperator_type'}"/>
                 </filter>
             </field>
         </record>