feat(balance): buff harvesting hides from animals

[NappingOcean]

Purpose of change

Getting more hides from animals by butchery.

Describe the solution

In harvest.json, we can see that mass_ratio field exists in skin type, gathering leather and the similars. All that field is 0.01 for human skin, 0.02 for others.
I change that numbers:
0.13 for small, 0.08 for middle, 0.04 for large.
The following table lists the animals in the game, and the former and latter maximum amount of raw hides or pelts that can be obtained from them.

Species	Max hides (before)	Max hides (after)
cow	160	400
deer	13	34
labrador mutt	4	39
wolf	4	21
coyote wolf	2	17
fox(gray)	0	6
jackrabbit	0	5
rabbit	0	2
Z-dog	6	16

Describe alternatives you've considered

Well. Looking up all of animals' hide ratio for their body mass, searching the headaching articles about biology or leather industries, or doing etc. In the end surely crying.

Testing

Additional context

Checklist