[FIX] sale: sales count button on variants

The button was no more redirecting to the
sales order lines list view,
following a distraction error introduced during 68b8286d

addons/sale/sale_view.xml

@@ -503,7 +503,7 @@
             <field name="arch" type="xml">
                 <xpath expr="//div[@name='buttons']" position="inside">
                     <button class="oe_inline oe_stat_button" name="action_view_sales"
-                        type="action" icon="fa-strikethrough">
+                        type="object" icon="fa-strikethrough">
                         <field string="Sales" name="sales_count" widget="statinfo" />
                     </button>
                 </xpath>