[FIX] mail: don't redirect to user's own partner form view

Clicking on the author of a message opens a DM with the corresponding user if
there is one, and opens the corresponding partner's form view otherwise.

When the author is the current user, obviously we don't want to open a DM with
ourself, but we probably don't want to open our partner form view either, which
was exactly the behavior before this rev.

addons/mail/static/src/xml/thread.xml

@@ -53,7 +53,7 @@
                         t-att-src="message.avatar_src"
                         data-oe-model="res.partner"
                         t-att-data-oe-id="message.author_id[0]"
-                        class="o_thread_message_avatar o_mail_redirect"/>
+                        t-attf-class="o_thread_message_avatar #{message.author_redirect ? 'o_mail_redirect' : ''}"/>
                 </t>
                 <t t-if="message.mailto || !message.author_id[0]">
                     <img t-if="message.avatar_src &amp;&amp; message.display_author"
@@ -80,7 +80,7 @@
                     </strong>
                     <strong t-if="!message.mailto &amp;&amp; message.author_id[0]"
                             data-oe-model="res.partner" t-att-data-oe-id="message.author_id[0]"
-                            class="o_mail_redirect">
+                            t-attf-class="#{message.author_redirect ? 'o_mail_redirect' : ''}">
                         <t t-esc="message.displayed_author"/>
                     </strong>
                     <strong t-if="!message.mailto &amp;&amp; !message.author_id[0]">