Randomize non-medical chem recipes every round

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The problem with chem is that it is used for purposes beneficial to the station only slightly more often than toxins is. There are, like, five useful chems, and no one makes them (except for personal use) because restocking medbay isn't exciting or experimental like researching the quickest way to kill a person with a single pill or working out the most efficient way of mass producing hellfoam.