[IMP] note: 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 :

  * note main menu action

This commit is linked to task ID 1889413.

addons/note/views/note_views.xml

@@ -203,7 +203,7 @@
       <field name="name">Notes</field>
       <field name="res_model">note.note</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="search_view_id" ref="view_note_note_filter"/>
       <field name="context">{}</field>
       <field name="help" type="html">