Set fieldsets to clear floated content inside them
Set fieldsets to clear floated content inside them

- Use the contain-floats placeholder
- Move this declaration above .form-group
- Remove unnecessary `clear:both` from .form-group

TFOH/govuk_elements,joelanman/govuk_elements,gavboulton/govuk_elements,alphagov/govuk_elements,gavboulton/govuk_elements,gavboulton/govuk_elements,alphagov/govuk_elements,TFOH/govuk_elements,joelanman/govuk_elements,gavboulton/govuk_elements,alphagov/govuk_elements,alphagov/govuk_elements