[IMP] point_of_sale: add activity view on main actions

Purpose is to extend the use of the newly-introduced activity view allowing
to see at a glance activities to perform on a given model. It eases daily
job of people working with activities.

Updated :

  * point_of_sale main menu action;

This commit is linked to task ID 1889413.

addons/point_of_sale/views/product_view.xml

@@ -16,7 +16,7 @@
         <field name="type">ir.actions.act_window</field>
         <field name="res_model">product.template</field>
         <field name="view_type">form</field>
-        <field name="view_mode">kanban,tree,form</field>
+        <field name="view_mode">kanban,tree,form,activity</field>
         <field name="context" eval="{'search_default_filter_to_availabe_pos': 1, 'default_available_in_pos': True}"/>
     </record>
     <record id="product_product_action" model="ir.actions.act_window">
@@ -24,7 +24,7 @@
         <field name="type">ir.actions.act_window</field>
         <field name="res_model">product.product</field>
         <field name="view_type">form</field>
-        <field name="view_mode">kanban,tree,form</field>
+        <field name="view_mode">kanban,tree,form,activity</field>
         <field name="context" eval="{'search_default_filter_to_availabe_pos': 1, 'default_available_in_pos': True}"/>
         <field name="domain" eval="[]"/>
         <field name="search_view_id" eval="False"/> <!-- Force empty -->