message: Add things from the pull request review
  Namely this adds the missing `data` property and changes the return type
  of _onKeyDown.
diff: @@ -32,6 +32,8 @@ declare class Dialog extends Application {
  */
  constructor(data: Dialog.Data, options: Partial<Dialog.Options>);
  + data: Dialog.Data;
  +
  /* -------------------------------------------- */
  /**
  @@ -75,7 +77,7 @@ declare class Dialog extends Application {
  * @param event - The keydown event
  */
  protected _onKeyDown(event: KeyboardEvent & { key: 'Escape' }): Promise<void>;
  - protected _onKeyDown(event: KeyboardEvent): void;
  + protected _onKeyDown(event: KeyboardEvent): Promise<void> | void;
  /* -------------------------------------------- */
  