fix: if customer change, set correct customer data to order

ajax/frontend/update.php

@@ -126,6 +126,7 @@ function ($orderHash, $orderData) {
                 }
 
                 $User->save(QUI::getUsers()->getSystemUser());
+                $Order->setCustomer($User);
             } catch (QUI\Exception $Exception) {
                 Log::addError($Exception->getMessage());
             }