Add option for one off in request to go live

When we first made this form you couldn’t send one off messages with
Notify. It’s interesting to us because it might help identity teams who
would benefit from email auth, or other features that we build in the
future for caseworkers.

app/templates/views/service-settings/request-to-go-live.html

@@ -44,9 +44,12 @@
           {{ textbox(form.start_date, width='1-1') }}
           {{ textbox(form.start_volume, width='1-1', hint='For example, ‘1000 a month’.') }}
           {{ textbox(form.peak_volume, width='1-1', hint='For example, ‘Messages will increase to 20,000 a month in January’.') }}
-          {{ radios(form.upload_or_api) }}
         </div>
-
+        {{ checkbox_group('How are you going to send messages?', [
+          form.method_one_off,
+          form.method_upload,
+          form.method_api
+        ]) }}
         <p>
           Once you’ve completed the tasks needed to set up, we’ll make your service live. We’ll do this within one working day.
         </p>