fix friendly mob breeding

trying to breed any friendly animal (cows, chickens, sheep, etc.) doesn't work as intended

only one of the animals in the stack gets the wheat, and you cant feed different one.

the intended behaviour (imho) is that we should be able to feed any mob in a stack, so that all 8 animals can breed. right now, it's as if we have 8x less animals since we can only feed 1 animal in a stack of up to 8.