Show at most 5 pie charts in the services list

refs #8205

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

@@ -60,7 +60,7 @@ if (count($services) === 0) {
       </td>
 
       <td>
-        <div class="sparkline-box"><?= $this->perfdata($service->service_perfdata, true, 8) ?> </div>
+        <div class="sparkline-box"><?= $this->perfdata($service->service_perfdata, true, 5) ?> </div>
         <?= $this->iconImage()->service($service) ?>
         <?= implode(' ', $this->serviceFlags($service)); ?>
         <?= $this->qlink(