[FIX] website_event: display ticket description correctly

Steps to reproduce:
 - create an event with a single ticket that has a description

Bug:
 The default quantity on the website is set to 0 where it should be 1

Cause:
 On this commit[1] adding description to a single ticket was done by
 applying the multiple tickets layout but this also sets qty to 0

Fix:
 removed the condition and added the description to the single ticket

opw-3018139

[1]:https://github.com/odoo/odoo/commit/9c4c953d004acaf916df348b670182b48b85d165

closes odoo/odoo#105819

X-original-commit: e9ab599113125bd55fdfd2e3d95f71f52e001660
Signed-off-by: Walid Hanniche (waha) <waha@odoo.com>

addons/website_event/views/event_templates_page_registration.xml

@@ -150,7 +150,7 @@
         <div id="o_wevent_tickets" class="o_wevent_theme_bg_base shadow-sm o_wevent_js_ticket_details" data-folded-by-default="0">
             <t t-set="tickets" t-value="event.event_ticket_ids.filtered(lambda ticket: not ticket.is_expired)"/>
             <!-- If some tickets expired and there is only one type left, we keep the same layout -->
-            <t t-if="len(event.event_ticket_ids) &gt; 1 or tickets.description">
+            <t t-if="len(event.event_ticket_ids) &gt; 1">
                 <div class="d-flex align-items-center py-2 ps-3 pe-2 border-bottom">
                     <span class="py-2 o_wevent_registration_title text-start">Tickets</span>
                     <div class="o_wevent_price_range d-none"/>
@@ -226,6 +226,10 @@
                             <span t-if="tickets" t-field="tickets.name"/>
                             <span t-else="">Registration</span>
                         </h6>
+                        <t t-if="tickets.description">
+                            <small t-field="tickets.description" class="text-muted py-2"/>
+                            <br/>
+                        </t>
                         <small t-if="tickets.end_sale_datetime and tickets.sale_available and not tickets.is_expired"
                             class="text-muted ms-1 me-3" itemprop="availabilityEnds">
                             Sales end on