[IMP] mail_print: Allow printing messages from incoming mail

Before this commit, the option to print messages was only available for messages sent from Odoo. After this commit, it is now possible to print incoming messages as well.

mail_print/static/src/components/message_action_list/message_action_list.xml

@@ -4,7 +4,7 @@
         <xpath expr="//span[@t-if='messageActionList.hasReplyIcon']" position="before">
             <!-- Show the "Print Message" button only on messages, not on notes. -->
             <PrintMessage
-                t-if="messageActionList.message.is_discussion &amp;&amp; !messageActionList.message.is_note"
+                t-if="!messageActionList.message.is_note"
                 message_id="messageActionList.message.id"
             />
         </xpath>