Stacked buckets bug

The wiki has confirmed that this is an actual change.

"Wet sponges, when smelted, will fill empty buckets in the 'fuel' slot with water if possible"

@Blah: It is indeed about the already fixed bug with the stacked buckets.

@Conor McS: Please don't be this aggressive when talking to someone else. Yes, he made a small mistake, but that is no reason to just verbally attack him. Take this as a warning, if you still going to create comments like this, we'll need to take further measures.