Update macerator recipe for new IC2 API

Fixes "java.lang.NoSuchMethodError: ic2.api.Ic2Recipes.addMaceratorRecipe(Lnet/minecraft/item/ItemStack;Lnet/minecraft/item/ItemStack;)V" crash with IC2 1.115.294.


(note: this PR only changes the code, doesn't update the build process - couldn't get the [ant](https://gist.github.com/agaricusb/5401865)-based build process to work, but I tested with an alternate build system on https://github.com/agaricusb/NetherOres/tree/fix-macerator and the macerator recipes functioned as expected.)