Header: Add h1 to service grid

refs #7976

modules/monitoring/application/views/scripts/list/servicegrid.phtml

@@ -6,12 +6,11 @@ use Icinga\Module\Monitoring\Object\Service;
 <?php if (!$this->compact): ?>
 <div class="controls">
   <?= $this->tabs; ?>
-  <div style="margin: 1em;" class="dontprint">
-    <?= $this->translate('Sort by'); ?> <?= $this->sortControl; ?>
-  </div>
+  <?= $this->sortControl; ?>
 </div>
 <?php endif ?>
 <div class="content" data-base-target="_next">
+  <h1 tabindex="-1"><?= $this->translate('Service Grid') ?></h1>
   <table class="pivot servicestates">
 <?php
 $hasHeader = false;