clip: true clips the axes’ labels

This should show "↑ Close" as the y axis label, but the label gets clipped.

```js
Plot.plot({
  clip: true,
  x: { domain: [new Date(2015, 0, 1), new Date(2015, 3, 1)] },
  marks: [
    Plot.areaY(aapl, { x: "Date", y: "Close", fill: "#eee" }),
    Plot.lineY(aapl, { x: "Date", y: "Close" })
  ]
})
```

Ref: #1792