message: fix(@nguniversal/express-engine): update schematic to be `noPropertyAccessFromIndexSignature` compliant
  When usign the CLI in strict mode `noPropertyAccessFromIndexSignature` typescript option will be enabled which forces index signatures to be accessed with square brackets.
diff: @@ -38,7 +38,7 @@ export function app(): express.Express {
  }
  function run(): void {
  - const port = process.env.PORT || <%= serverPort %>;
  + const port = process.env['PORT'] || <%= serverPort %>;
  // Start up the Node server
  const server = app();
  