Probably enotice on settings form

[eileenmcnaughton]

I haven't double checked but I was checking settings in conjunction with civicrm/civicrm-core#13048 & I'm pretty sure you will have an enotice on yours as $_settings is not defined - I would recommend changing from extends CRM_Admin_Form_Setting to just CRM_Core_Form - you are not really using functionality from the settings form and it's not really supported as an integration point - I think it could well be completely deleted in the future

Note I recommend the same action for com.cividesk.normalize & com.cividesk.helptab