added case for user to only delete their own reservations

src/ReserveReservationAccessControlHandler.php

@@ -36,6 +36,9 @@ class ReserveReservationAccessControlHandler extends EntityAccessControlHandler
 
       case 'delete':
         $access =  AccessResult::allowedIfHasPermission($account, 'delete any reservation');
+        if (!$access->isAllowed() && $account->hasPermission('delete own reservation')) {
+          $access = $access->orIf(AccessResult::allowedIf($account->id() == $entity->getOwnerId())->cachePerUser()->addCacheableDependency($entity));
+        }
         break;
 
       // Unknown operation, no opinion.