Ah, sorry, there was a line that needed to be comment out as well.
Line 4899 - this.drawItem(index + 1);
That line draws the craft button. Comment it out, as the change I had you make draws the craft button in index 4 instead of index 5.
Also, line 6217 does a check to see if you've pressed ok on an ingredient slot, or the craft button by comparing the index, you'll need to change the <= 3 on that line to a <= 2 so that it knows you're hitting the craft button that we've moved up an index slot.