change test to slider for disk create

app/UI/Disk/Forms/CreateForm.php

@@ -69,7 +69,7 @@ class CreateForm extends BaseForm implements ClientArea
         $field->setAvailableValues($options);
         if(count($this->configuration()->getAdditionalDiskType()) == 1) {
             $field->setSelectedValue($this->configuration()->getAdditionalDiskType()[0]);
-            $field->addHtmlAttribute('hidden', true);
+            $field->addClass('hidden');
         }
         $this->addField($field);
         //format
@@ -81,7 +81,7 @@ class CreateForm extends BaseForm implements ClientArea
         $field->setAvailableValues($options);
         if(count($this->configuration()->getAdditionalDiskFormat()) == 1){
             $field->setSelectedValue($this->configuration()->getAdditionalDiskFormat()[0]);
-            $field->addHtmlAttribute('hidden', true);
+            $field->addClass('hidden');
         }
         $this->addField($field);
         //backup