[FIX] event: events smartbutton on partner display if user has rights

With a user that do not have access to the the Event module,
go into Contacts > open a contact

Before this commit, a ACL error was thrown. This was because of the presence of
a smartbutton refering to events in the form view of the partner

After this commit, the form view of the partner displays correctly

OPW 1851783
closes #24931

addons/event/views/res_partner_views.xml

@@ -5,6 +5,7 @@
             <field name="name">view.res.partner.form.event.inherited</field>
             <field name="model">res.partner</field>
             <field name="inherit_id" ref="base.view_partner_form"/>
+            <field name="groups_id" eval="[(4, ref('event.group_event_user'))]"/>
             <field name="arch" type="xml">
                 <div name="button_box" position="inside">
                     <button class="oe_stat_button"