[FIX] website_event_exhibitor: fix display of sponsor content when image overflows

SPECIFICATIONS

It sponsor image is higher than sponsor information, sponsor description is
moved on the right due to image. It leads to a strange display.

With this fix sponsor description begins below image, leading to a cleaner
display of sponsor data.

LINKS

Task ID-2326433
COM PR odoo/odoo#61781
ENT pr odoo/enterprise#14752
UPG PR odoo/upgrade#1931

addons/website_event_exhibitor/views/event_exhibitor_templates_page.xml

@@ -90,7 +90,7 @@
         <!-- SPONSOR DESCRIPTION -->
         <span class="h5 d-inline-block mx-3 mt-3 mb-0">About <t t-esc="sponsor.name"/></span>
         <hr class="mt-2 mb-0"/>
-        <div class="ml-3">
+        <div class="ml-3 clearfix">
             <div class="float-left pt-3">
                 <span t-if="sponsor.image_512" t-field="sponsor.image_512" class="o_wevent_online_page_avatar"
                     t-options="{'widget': 'image', 'max-width': '96'}"/>