LPS-48519 - Remove 'sortBox' method from Liferay.Util.

Hi Nate,

Attached is an update for https://issues.liferay.com/browse/LPS-48519.

I included (e98f11a) from https://issues.liferay.com/browse/LPS-48516 as part of this pull because ```moveItem``` calls ```sortBox```.

Please let me know if there are any issues.

Thanks!