[IMP] base_import: show import button on kanban view.

PURPOSE
=======

Import button in list view only, its confusing for first time user.
When people start using Odoo first thing they try to import contacts or products.

Specificaion
============

Import button should be display in kanban view also

addons/base_import/static/src/js/base_import.js

@@ -89,6 +89,8 @@ ListView.include({
     }
 });
 
+// Enable import button on kanban view.
+KanbanView.prototype.defaults.import_enabled = true;
 KanbanView.include({
     /**
      * Extend the render_buttons function of KanbanView by adding an event listener