message: fix(ActionSheet): fix that close is invalid without title
diff: position: absolute;
  top: 0;
  right: 0;
  + z-index: 1;
  padding: var(--van-action-sheet-close-icon-padding);
  color: var(--van-action-sheet-close-icon-color);
  font-size: var(--van-action-sheet-close-icon-size);
  