message: App: Fix minor prefer-const issue
diff: @@ -52,7 +52,7 @@ export class UserImageDirective implements OnInit, OnDestroy {
  const user = new User(this.user);
  // TODO: Provide a way to supply the image pixel size to user.getUserImageURL for the gravatar path.
  - let url = user.getUserImageURL();
  + const url = user.getUserImageURL();
  this.backgroundImage = this.domSanitizer.bypassSecurityTrustStyle(`url(${url})`);
  }
  }
  