message: Fix show less button occluding the last tile
  Fixes
  People may have to click various combinations of 'show more' and 'show less' until it fixes itself, as their layout could be a bit weird now.
diff: @@ -624,11 +624,15 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
  const showMoreAtMinHeight = minTiles < this.numTiles;
  const minHeightPadding = RESIZE_HANDLE_HEIGHT + (showMoreAtMinHeight ? SHOW_N_BUTTON_HEIGHT : 0);
  const minTilesPx = layout.tilesToPixelsWithPadding(minTiles, minHeightPadding);
  - const maxTilesPx = layout.tilesToPixelsWithPadding(this.numTiles, this.padding);
  + let maxTilesPx = layout.tilesToPixelsWithPadding(this.numTiles, this.padding);
  const showMoreBtnClasses = classNames({
  'mx_RoomSublist2_showNButton': true,
  });
  + if (this.numTiles > this.layout.defaultVisibleTiles) {
  + maxTilesPx += SHOW_N_BUTTON_HEIGHT;
  + }
  +
  // If we're hiding rooms, show a 'show more' button to the user. This button
  // floats above the resize handle, if we have one present. If the user has all
  // tiles visible, it becomes 'show less'.
  