Frank Yung-Fong Tang 9d0072df3d Fixes {format,formatToParts}/en-us-numeric-auto.js (#2207)
The following lines expect each unit has property "-1" and "1" 
```
  const expected = unit in exceptions
    ? [exceptions[unit]["1"], exceptions[unit]["0"], exceptions[unit]["0"], exceptions[unit]["-1"]]
    : [`in 1 ${unit}`, `in 0 ${unit}s`, `0 ${unit}s ago`, `1 ${unit} ago`];
```
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