Make Alchemy flasks non-repairable

setting alchemy flasks to be non-repairable, will stop items such as the ars magica repairer and my anvil from being able to repair flasks, which should be what you'd want from what I understand, since they have their own special repair method.
Merge pull request #7 from joshiejack/patch-1

Make Alchemy flasks non-repairable