bugfix max value in range slider

app/UI/Disk/Forms/UpdateForm.php

@@ -49,7 +49,7 @@ class UpdateForm extends BaseForm implements ClientArea
         $rangeField->setMinValue($diskSize);
         $rangeField->setDefaultValue($diskSize);
         if ($this->configuration()->serverDiskSize->max > ($this->resourceManager->disk()->free() + $diskSize)) {
-            $rangeField->setMaxValue($this->resourceManager->disk()->free() + $diskSize);
+            $rangeField->setMaxValue($this->resourceManager->disk()->free());
         } else {
             $rangeField->setMaxValue($this->configuration()->serverDiskSize->max);
         }