"Fixes" predator stun durations (#5302)

# About the pull request
(this is up for debate from the council / pred players)

After fira fixed the code it actually works which has resulted in
predators gettiing up from stuns way faster then ""intended"" im using
intended because it was balanced around a system which didnt work, and
now that it works they get up "faster"
# Explain why it's good for the game

predators are already busted to fight against as a xenomorph and their
only counter (stuns) not working properly is not fun to play against

# Testing Photographs and Procedure

<details>



https://github.com/cmss13-devs/cmss13/assets/47158596/0226dd1e-0a7b-4cf6-8f9b-f873f28616d6



https://github.com/cmss13-devs/cmss13/assets/47158596/bc16e62f-924e-40a6-a969-a83840867db7




https://github.com/cmss13-devs/cmss13/assets/47158596/3af3f5e1-faea-4ae8-bc34-e162cb2238b5

^^^^ NEW
 ↓ ↓ ↓ OLD




https://github.com/cmss13-devs/cmss13/assets/47158596/6755d095-81fd-40f9-89c2-89532cb1a50e


https://github.com/cmss13-devs/cmss13/assets/47158596/66327438-4e2c-45fa-bc2b-bafe041e2607



https://github.com/cmss13-devs/cmss13/assets/47158596/3b9fad3b-559a-4a74-9968-0f818a27ac04






</details>


# Changelog


:cl:
balance: Properly tweaks predator stun resist back to what it should
have been.
/:cl:

---------

Co-authored-by: InsaneRed <[email protected]>

code/modules/mob/living/carbon/human/species/yautja/_species.dm

@@ -53,8 +53,8 @@
 		/mob/living/carbon/human/proc/mark_panel,
 	)
 
-	knock_down_reduction = 4
-	stun_reduction = 4
+	knock_down_reduction = 1.5
+	stun_reduction = 1.5
 	weed_slowdown_mult = 0 // no slowdown!
 
 	icobase = 'icons/mob/humans/species/r_predator.dmi'