change style 'maxHeight' to 'height'

[LesterWeng]

if (fixHeader) {
    scrollYStyle = {
      overflowY: 'scroll',
      maxHeight: scroll.y,
    };
  }

if set maxHeight，when height of content is smaller than 'scroll.y'，pagination will placed at the bottom of table，but i think most of user want to place pagination into bottom of container which we set by 'scroll.y'

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