monitoring/CSS: Remove deprecated table class action in the event history overview

refs #5543

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

@@ -21,7 +21,7 @@ if (! $this->compact): ?>
 </div>
 <?php endif ?>
 <div class="content">
-    <table data-base-target="_next" class="action action-table">
+    <table data-base-target="_next" class="action-table">
     <tbody>
     <?php foreach ($history->peekAhead() as $event):
         $icon = 'help';