feat(content): Generic writ of trade

[Zlorthishen]

Purpose of change

changes NPC's Writ of trade from BOOK to GENERIC

Describe the solution

changes More NPC's Writ of trade item from type BOOK to type GENERIC

Describe alternatives you've considered

Testing

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Additional context

Checklist

[chaosvolt]

You'll need to remove the book-specific bits from the items, namely intelligence and time.

Setting stackable to true might also be good?

[chaosvolt]

Weird, I might have to later on follow up with an update to move this to currency files and see what it's missing to allow it to stack, oh well.