nicehash: use hashrate sold, instead of hashrate produced about autominer

[hossbeast]

The data from this API looks like

{
  "profitability": "0.00001367",
  "data": [
    {
      "a": "109.52"
    },
    "0.00212766"
  ],
  "name": "Lyra2REv2",
  "suffix": "MH",
  "algo": 14
}

It's refreshed every 30 seconds, but it seems to be reporting on the trailing 5 minutes, so the data isn't useful until you've been mining that algo for 5 minutes.

(it continues to report a nonzero accepted speed after you stop mining an algo, which continually declines over 5 minutes, and then goes to zero).