CRM-12328 switched references to group object for add_to_group_id and add_captcha.

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* CRM-12328: Profiles: "Add new contacts to group" AND "Include reCaptcha" settings are broken in profile forms
  http://issues.civicrm.org/jira/browse/CRM-12328
Merge pull request #397 from davecivicrm/CRM-12328

CRM-12328 switched references to group object for add_to_group_id and ad...