Wrong scroll bar position for small lists (16 elements)

[baychak]

Bug in https://vega.github.io/vega/examples/table-scrollbar.vg.json for top position

Suggested fix:
Change

    {
      "name": "scaleScrollBarY",
      "type": "linear",
      "domain": [1, {"signal": "scrollPositionMax"}],
      "range": [
        {"signal": "0"},
        {"signal": "rowHeight*rowsToDisplay-scrollBarHeight-1"}
      ]
    },

to:

    {
      "name": "scaleScrollBarY",
      "type": "linear",
      "domain": [0, {"signal": "scrollPositionMax - 1"}],
      "range": [
        {"signal": "1"},
        {"signal": "rowHeight*rowsToDisplay-scrollBarHeight-1"}
      ]
    },

and in line 165 change:
"y": {"scale": "scaleScrollBarY", "signal": "scrollPosition"},
to:
"y": {"scale": "scaleScrollBarY", "signal": "scrollPosition - 1"},

After fix: