fix(content): Fix inappropriate vitamin extensions

[RobbieNeko]

Checklist

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• I wrote the PR title in conventional commit format.
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Purpose of change

Animal cooking oil claimed to have veggy in it, all the sandwiches claimed to have the allergens of a deluxe sandwich, and veggy sausage was somehow not actually vegetarian.

copy-from does not overwrite vitamins, but rather extends them.

Describe the solution

• Remove copy-from from animal cooking oil and veggy sausage
• Change the sandwiches over to a generic sandwich item to copy from ala the MREs

Describe alternatives you've considered

• Wait for someone to dive into the clusterfuck that is the inheritance code to fix it from the C++ side and make it behave how you'd expect
• Implode
• Sleep

Testing

Load-tested and made sure everything worked appropriately for the vitamins

Additional context

I wouldn't be surprised if there's more questionable allergens elsewhere thanks to the script or weird copy-froms.

At some point we really need to bite the bullet and deal with copy-from not behaving

Wait, gotta rerun this failed check to confirm it was a fluke

[RobbieNeko]

Re-running that one test build