message: Simplifies AppDelegate for Swift TestApp.
diff: import UIKit
  @UIApplicationMain
  -
  final class AppDelegate: UIResponder, UIApplicationDelegate {
  -
  - /// The main window of the app.
  var window: UIWindow?
  -
  - func application(
  - _ application: UIApplication,
  - didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil
  - ) -> Bool {
  - return true
  - }
  }
  