Fix incorrect percentage calculation

public/typo3conf/ext/ep_products/Classes/Controller/AjaxContingentController.php

@@ -127,7 +127,7 @@ class AjaxContingentController extends ActionController
             $paxAvaiable = $event->getAvailable();
 
             if ($paxTotal > 0) {
-                $percentageBooked = round($paxAvaiable / $paxTotal * 100);
+                $percentageBooked = 100 - round($paxAvaiable / $paxTotal * 100);
             } else {
                 $percentageBooked = 100;
             }