Web accessibility: focus order is wrong.

[gentlee]

On web platform when pressing Tab key on keyboard, rows are focused not one after another, but with strange order.

For example after 16 row it starts focusing header and browser buttons, and only then continues to focus 17 etc.

Possible reason is incorrect element positions in DOM.

Usage example:

<RecyclerListView
  canChangeSize
  suppressBoundedSizeException
  style={styles.recyclerListView}
  dataProvider={dataProvider}
  layoutProvider={this.layoutProvider}
  rowRenderer={this.renderRecyclerListViewRow}
  isHorizontal={false}
  forceNonDeterministicRendering={isWeb ? this.isMounted : true}
  extendedState={extendedState}
  onVisibleIndicesChanged={visibleIndicesChangedHandler}
  contextProvider={this.contextProvider}
/>