message: fix: UI url when provisioning Heroku
diff: @@ -19,7 +19,7 @@ heroku config:set --app ${PREFIX}-origin-api-${STAGE} \
  ISSUER_ID='Issuer ID' \
  JWT_EXPIRY_TIME='7 days' \
  REGISTRATION_MESSAGE_TO_SIGN='I register as Origin user' \
  - UI_BASE_URL=https://${PREFIX}-origin-ui-${STAGE}.herokuapp.com/ \
  + UI_BASE_URL=https://${PREFIX}-origin-ui-${STAGE}.herokuapp.com \
  WEB3='https://volta-rpc-origin-0a316ab339e3d2ee3.energyweb.org' \
  DEPLOY_KEY='<KEY>' \
  EXCHANGE_ACCOUNT_DEPLOYER_PRIV='<KEY>' \
  