Fix broken sorting in Gradebook (SIS ID column)

Swap the order so the `sis_id` line does not get included in the previous line inside the `.match()` method when the CoffeeScript compiled into JS.

This is what happened before:

```js
b.sortCol.field.match(/^custom_col/ || b.sortCol.field === "sis_id")
```

And this is what we want (order doesn't matter):

```js
b.sortCol.field.match(/^custom_col/) || b.sortCol.field === "sis_id"
```

See these two commits for related history:
* https://github.com/sfu/canvas-lms/commit/4ec07910f0ae9625c794eccbae5dd0c217f2b392