fix(date-preset-off-by-one): adjust date range for "Last <x> days" presets

[#84956156](https://www.pivotaltracker.com/story/show/84956156)

Date presets that select the "Last x days" (e.g "Last 7 days") were including an extra day in the selection.

This has been corrected by subtracting 1 day from these presets since they are inclusive of the current day:

```js
// today() is a moment instance

last7days: function () {
    return {
        from: today().subtract(7, 'days'), 
        to: today()
    };
}
```

becomes
```js
last7days: function () {
    return {
        from: today().subtract(6, 'days'),
        to: today()
    };
}
```