change test to slider for disk create

app/UI/Disk/Forms/UpdateForm.php

@@ -62,7 +62,7 @@ class UpdateForm extends BaseForm implements ClientArea
         logModuleCall(
             'proxmoxCloud',
             __FUNCTION__,
-            $this->formData,
+            $this->getFormData(),
             'Debug',
             $vm->getHardDisks()
         );