[FIX] website_event: fix end date weekday

Fix the displayed end date weekday on an event's registration page. See #39698

addons/website_event/views/event_templates.xml

@@ -443,7 +443,7 @@
                             </t>
                             <t t-else="">
                                 <i class="fa fa-long-arrow-down d-block text-muted mx-3 my-2" style="font-size: 1.5rem"/>
-                                <span t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'date_only': 'true', 'format': 'EEEE'}"/>
+                                <span t-field="event.with_context(tz=event.date_tz).date_end" t-options="{'date_only': 'true', 'format': 'EEEE'}"/>
                                 <h4 class="my-1" t-field="event.with_context(tz=event.date_tz).date_end" t-options="{'date_only': 'true', 'format': 'long'}"/>
                                 <t t-if="not event.is_one_day">End -</t>
                                 <span t-field="event.with_context(tz=event.date_tz).date_end" t-options="{'time_only': 'true', 'format': 'short'}"/>