clean the config const
clean the config const

adeelq/dotmailer-magento2-extension,dotmailer/dotmailer-magento2-extension,dotmailer/dotmailer-magento2-extension,dotmailer/dotmailer-magento2-extension,cdiacon/dotmailer-magento2-extension,adeelq/dotmailer-magento2-extension,cdiacon/dotmailer-magento2-extension,adeelq/dotmailer-magento2-extension,cdiacon/dotmailer-magento2-extension