message: fix logic for checking if video is already playing
  (and fix typo in message)
diff: @@ -324,8 +324,8 @@ export class BrowserCodeReader {
  */
  async tryPlayVideo(videoElement: HTMLVideoElement): Promise<void> {
  - if (!this.isVideoPLaying(videoElement)) {
  - console.warn('Trying yo play video that is already playing.');
  + if (this.isVideoPLaying(videoElement)) {
  + console.warn('Trying to play video that is already playing.');
  return;
  }
  