Update GOVUK Frontend component JS selectors
Update GOVUK Frontend component JS selectors

GOVUK Frontend components with JS identify
themselves via a `data-module` data attribute
instead of a class from version 3.0.0.

This updates the selectors used to find those
elements to match the data-attribute instead.§

alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin