message: [bugfix] Checkbox: label height
diff: &__icon,
  &__label {
  - height: @checkbox-size;
  display: inline-block;
  vertical-align: middle;
  line-height: @checkbox-size;
  }
  &__icon {
  + height: @checkbox-size;
  +
  .van-icon {
  font-size: 14px;
  color: transparent;
  