[IMP] event: show total of reserved seats in list view

task-2066537

closes odoo/odoo#36417

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/event/views/event_views.xml

@@ -287,7 +287,7 @@
                     <field name="event_type_id"/>
                     <field name="date_begin"/>
                     <field name="date_end"/>
-                    <field name="seats_reserved"/>
+                    <field name="seats_reserved" sum="Total"/>
                     <field name="seats_min"/>
                     <field name="seats_max" invisible="1"/>
                     <field name="user_id"/>