fix: hides after being smoked get merged into one

[NappingOcean]

Purpose of change

After being smoked, the hides and felts get a correct number.

Describe the solution

Put the field "stackable":true

Then it looks fixed at all.

Describe alternatives you've considered

screm

Testing

Additional context

Before

After

Checklist

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[chaosvolt]

I'm gonna hope there are no potential obscure bugs from this but should be unlikely snce cured hides/pelts are used in fewer things that leather/fur patches which also got the stacking treatment. :3