KISS - Keep Inventories Sorted, Simple

• Always sort shulker boxes to the front
  • Only works properly in ID sorting mode
  • Hence ID sorting mode is the new default

I had assumed this was already the case, but it was just a coincidence in my tests. If you were already using the mod, you may need to switch to ID sorting manually.

Might get rid of different modes altogether – I'd rather have one that works well. I'll check if I can make it work properly with the other modes first, though.