Make default setting for agreement and fix enter key for dataset form

hyrax/app/assets/javascripts/dataset_form.js

hyrax/app/views/hyrax/base/_form_progress.html.erb

hyrax/config/locales/hyrax.en.yml

hyrax/lib/tasks/default_setting_for_deposit_agreement.rake

hyrax/lib/tasks/setup_hyrax.rake