[FIX] website_mail: remove class which hide the attachment

Attachment should be visible in website chatter.
Due to a bad copy/paste, the attachments are hidden
when website_mail_channel is installed.

addons/website_mail/views/website_mail_templates.xml

@@ -84,14 +84,12 @@
                                 <t t-set="object" t-value="message"/>
                                 <t t-call="website.publish_short"/>
                                 <div t-field="message.body"/>
-                                <div class="o_mg_link_content">
                                     <div class="col-md-2 col-sm-3 text-center" t-foreach='message.attachment_ids' t-as='attachment'>
                                         <a t-attf-href="/web/content/#{attachment.id}?download=true" target="_blank">
                                             <div class='oe_attachment_embedded o_image' t-att-title="attachment.name" t-att-data-mimetype="attachment.mimetype" t-attf-data-src="/web/image/#{attachment.id}/100x80"/>
                                             <div class='oe_attachment_name'><t t-raw='attachment.name' /></div>
                                         </a>
                                     </div>
-                                </div>
                             </div>
                             </div>
                         </li>