Revert a change

Viewer/assets/templates/default/navbar.html

@@ -472,7 +472,7 @@
     </div>
     {{/unless}}
     <div class="default-control">
-        {{#unless false}}
+        {{#unless hideHelp}}
         <button class="help" id="help-button" title="Help">
             <span class="icon help-icon"></span>
         </button>