[MIRROR] Makes nerve splicing surgery reduce stamina damage [MDB IGNORE] (#18837)

Makes nerve splicing surgery reduce stamina damage (#72661)

## About The Pull Request

Makes nerve splicing surgery also reduce stamina damage by 20% (amount
of stun/stamina reduction can be changed if requested).

## Why It's Good For The Game

Most of stun sources now come from stamina damage, so this surgery is
kinda useless in most cases. This PR makes it more usefull in the
current combat system, while not making it too OP.

## Changelog

🆑
balance: Nerve splicing surgery now additionaly reduces stamina damage
taken by 20%
/🆑

Co-authored-by: SuperSlayer <91609255+SuperSlayer0@users.noreply.github.com>

code/modules/surgery/advanced/bioware/nerve_splicing.dm

@@ -39,6 +39,8 @@
 	)
 	display_pain(target, "You regain feeling in your body; It feels like everything's happening around you in slow motion!")
 	new /datum/bioware/spliced_nerves(target)
+	if(target.ckey)
+		SSblackbox.record_feedback("nested tally", "nerve_splicing", 1, list("[target.ckey]", "got")) 
 	return ..()
 
 /datum/bioware/spliced_nerves
@@ -49,7 +51,9 @@
 /datum/bioware/spliced_nerves/on_gain()
 	..()
 	owner.physiology.stun_mod *= 0.5
+	owner.physiology.stamina_mod *= 0.8
 
 /datum/bioware/spliced_nerves/on_lose()
 	..()
 	owner.physiology.stun_mod *= 2
+	owner.physiology.stamina_mod *= 1.25