Allow `confirm_email` & `terms_of_service` to show in extra fields.

CHANGELOG.md

+- Role: edxapp
+  - Let `confirm_email` in `EDXAPP_REGISTRATION_EXTRA_FIELDS` default to `"hidden"`.
+  - Let `terms_of_service` in `EDXAPP_REGISTRATION_EXTRA_FIELDS` default to `"hidden"`.
+
 - Role: ecommerce
   - Added ECOMMERCE_LANGUAGE_COOKIE_NAME which is the name of the cookie the ecommerce django app looks at for determining the language preference.
-  
+
 - Role: neo4j
   - Enabled splunk forwarding for neo4j logs.
   - Increased maximum amount of open files to 40000, as suggested by neo4j.

playbooks/roles/edxapp/defaults/main.yml

@@ -486,12 +486,14 @@ EDXAPP_ANALYTICS_DATA_URL: ""
 EDXAPP_ANALYTICS_DASHBOARD_URL: "http://localhost:18110/courses"
 
 EDXAPP_REGISTRATION_EXTRA_FIELDS:
+  confirm_email: "hidden"
   level_of_education: "optional"
   gender: "optional"
   year_of_birth: "optional"
   mailing_address: "hidden"
   goals: "optional"
   honor_code: "required"
+  terms_of_service: "hidden"
   city: "hidden"
   country: "required"