Apply Padding at yForLegendRect

Currently there is a fixed value used for `yForLegendRect`:

```
yForLegendRect = function yForLegendRect(id, i) {
return yForLegend(id, i) - 5;
};
```

But the `paddingTop` can be changed and should be used here imho:
```
yForLegendRect = function yForLegendRect(id, i) {
return yForLegend(id, i) - (paddingTop + 1);
};
```

Am I right?