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:

    b.sortCol.field.match(/^custom_col/ || b.sortCol.field === "sis_id")

And this is what we want (order doesn't matter):

    b.sortCol.field.match(/^custom_col/) || b.sortCol.field === "sis_id"
Merge pull request #148 from va7map/canvas188-sort_fix-3

Fix broken sorting in Gradebook (SIS ID column)