Fix leave icon

src/templates/chatroom_head.html

@@ -10,7 +10,7 @@
     <p class="chatroom-description">{{{ o.description }}}<p/>
 </div>
 <div class="chatbox-buttons row no-gutters">
-    <a class="chatbox-btn close-chatbox-button fa fa-sign-out" title="{{{o.info_close}}}"></a>
+    <a class="chatbox-btn close-chatbox-button fa fa-sign-out-alt" title="{{{o.info_close}}}"></a>
     {[ if (o.affiliation == 'owner') { ]}
     <a class="chatbox-btn configure-chatroom-button fa fa-wrench" title="{{{o.info_configure}}} "></a>
     {[ } ]}