message: Fix EventSystem issue when tap event never fires
diff: @@ -496,8 +496,8 @@ export class EventSystem
  {
  const touch = event.changedTouches[i] as PixiTouch;
  - if (typeof touch.button === 'undefined') touch.button = event.touches.length ? 1 : 0;
  - if (typeof touch.buttons === 'undefined') touch.buttons = event.touches.length ? 1 : 0;
  + if (typeof touch.button === 'undefined') touch.button = 0;
  + if (typeof touch.buttons === 'undefined') touch.buttons = 1;
  if (typeof touch.isPrimary === 'undefined')
  {
  touch.isPrimary = event.touches.length === 1 && event.type === 'touchstart';
  