[IMP] mail_tracking: Put button box at the end of the view

For giving more priority to other buttons like the invoices one.

mail_tracking/views/res_partner_view.xml

@@ -6,6 +6,7 @@
 <record model="ir.ui.view" id="view_partner_form">
     <field name="name">Partner Form with tracking emails</field>
     <field name="model">res.partner</field>
+    <field name="sequence">46</field>
     <field name="inherit_id" ref="base.view_partner_form"/>
     <field name="arch" type="xml">
         <div name="button_box" position="inside">