render helpbar widgets without layout, fixes #4896

Closes #4896

Merge request studip/studip!3668

lib/classes/helpbar/HelpbarWidget.php

@@ -2,7 +2,8 @@
 class HelpbarWidget extends Widget
 {
     public $icon = false;
-    
+    protected $layout = false;
+
     public function setIcon($icon)
     {
         $this->icon = $icon;