move presentation tub to right

src/server/views/widget/page_tabs.html

@@ -42,14 +42,14 @@
   #}
 
   {% if not page.isPortal() %}
-    <li class="nav-item">
+    <li class="nav-item ml-md-auto">
       <a href="?presentation=1" class="nav-link toggle-presentation">
         <i class="icon-film"></i><span class="hidden-xs"> {{ t('Presentation Mode') }}</span>
       </a>
     </li>
   {% endif %}
 
-  <li class="nav-item ml-md-auto">
+  <li class="nav-item">
     <a class="nav-link" href="#revision-history" role="tab" data-toggle="tab">
       <i class="icon-layers"></i><span class="hidden-xs"> {{ t('History') }}</span>
     </a>