[FIX] point_of_sale: hide non-active pos.configs from dashboard

The introduction of the new pos.config dashboard at
48ab50ed0d does not filter non-active
pos.configs. There are no constraints against opening sessions on
inactive or deprecated pos.configs so after deprecating/inactivating
users could still open new sessions through the dashboard.

opw-673020

addons/point_of_sale/point_of_sale_view.xml

@@ -979,6 +979,7 @@
             <field name="view_type">form</field>
             <field name="view_mode">kanban,tree,form</field>
             <field name="search_view_id" ref="view_pos_config_search" />
+            <field name="domain">[('state','=','active')]</field>
             <field name="help" type="html">
               <p class="oe_view_nocontent_create">
                 Click to create a new PoS config.