Defining :original for add_captcha_admin_option

responding to warning:

[1;32mDeface:[0m 'add_captcha_admin_option' matched 1 times with '[data-hook='admin_configurations_sidebar_menu']'
[1;32mDeface: [WARNING][0m No :original defined for 'add_captcha_admin_option', you should change its definition to include:
 :original => '79c014804a1949e83a2a83e78e09ed66e63027cf'

 Fixes #36