change test to slider for disk create

app/UI/Disk/Forms/CreateForm.php

@@ -55,7 +55,7 @@ class CreateForm extends BaseForm implements ClientArea
     {
         //size
         $this->resourceManager = new ResourceManager();
-        $field = new Range('size', $this->configuration()->serverDiskSize->min, $this->resourceManager->disk()->free());
+        $field = new Range('disk', $this->configuration()->serverDiskSize->min, $this->resourceManager->disk()->free());
         $field->addValidator(new DiskSizeValidator('additionalDiskSize',true));
         $field->setDefaultValue($this->configuration()->serverDiskSize->min);
         $field->setDescription('description');