message: ssr: Fix wallet domain config
diff: // Note that the SDK (which holds these constants) is a TS lib, so we can't
  // require it in this CJS file.
  -const MERCHANT_PAYMENT_UNIVERSAL_LINK_HOSTNAME = 'ssr-wallet.cardstack.com';
  +const MERCHANT_PAYMENT_UNIVERSAL_LINK_HOSTNAME = 'wallet.cardstack.com';
  const MERCHANT_PAYMENT_UNIVERSAL_LINK_STAGING_HOSTNAME =
  - 'ssr-wallet-staging.stack.cards';
  + 'wallet-staging.stack.cards';
  const universalLinkHostnamesByTarget = {
  staging: MERCHANT_PAYMENT_UNIVERSAL_LINK_STAGING_HOSTNAME,
  