Strip commas from estimated volumes

We suggest people format their numbers with commas when telling us how
many things they’re going to send.

This causes problems when we paste these values into a spreadsheet,
because the commas get interpreted as column separators.

app/main/views/service_settings.py

@@ -173,9 +173,9 @@ def submit_request_to_go_live(service_id):
                 '{user_email}, '
                 '-, '
                 '{date}, '
-                '{volume_sms}, '
-                '{volume_email}, '
-                '{volume_letter}'
+                '{volume_sms_normalised}, '
+                '{volume_email_normalised}, '
+                '{volume_letter_normalised}'
             ).format(
                 service_name=current_service.name,
                 service_dashboard=url_for('main.service_dashboard', service_id=current_service.id, _external=True),
@@ -183,8 +183,11 @@ def submit_request_to_go_live(service_id):
                 agreement=AgreementInfo.from_current_user().as_human_readable,
                 checklist=current_service.go_live_checklist_completed_as_yes_no,
                 volume_email=form.volume_email.data,
+                volume_email_normalised=form.volume_email.data.replace(',', ''),
                 volume_sms=form.volume_sms.data,
+                volume_sms_normalised=form.volume_sms.data.replace(',', ''),
                 volume_letter=form.volume_letter.data,
+                volume_letter_normalised=form.volume_letter.data.replace(',', ''),
                 research_consent=form.research_consent.data.title(),
                 service_id=current_service.id,
                 organisation=AgreementInfo.from_current_user().owner,