Skrell Adjustments (#4989)

## About The Pull Request
Flash protection for Skrell raised from **Sensitive** to **None** in
respect to their other weaknesses. Copper blood color changed to be
_oxidized copper_, teal-ish. More distinct. Issues raised by an
anonymous player and I put together the PR. In the event the flash
protection change is deemed too heavy balance-wise, I'll make changes
here to change the description of Skrell to include their flash
sensitivity, as it is unlisted.

<img width="800" height="416" alt="copper-oxide"
src="https://github.com/user-attachments/assets/f0031948-b1a8-4731-bbcd-522711617537"
/>

There is a fish in the details tab.
<details>


![Porcupine-fish-Diodon-hystox](https://github.com/user-attachments/assets/ee97054a-d6b8-4b0e-b467-a716e028c0fb)
**A porcupine fish in the Andaman Sea**
Diodon hystrix is a species of porcupine fish. These fishes are short
and broad-bodied, with large eyes and spines covering their skin. Like
puffer fishes, they inflate their bodies when threatened.
[https://www.britannica.com/animal/fish](https://www.britannica.com/animal/fish)
</details>

## Why It's Good For The Game
Skrell already have some substantial weaknesses to Brute and Cold
damage. Flash weakness atop that is somewhat silly. Given they're oxygen
breathers, the copper-based blood in their systems would be teal, rather
than copper-colored. More distinct than the previous brown color, makes
the race more interesting.
## Proof Of Testing
I did not test it because TGUI refused to load after I compiled it
(multiple times), which prevented me from using admin tooling or
creating my character. It _should_ work right out of the box, given it's
just minor details changed.
## Changelog
🆑 Bangle
balance: rebalanced something
code: changed some code
/🆑

code/__DEFINES/~~bubber_defines/colors.dm

@@ -10,7 +10,8 @@ GLOBAL_LIST_INIT(chat_colors_by_mob_name, list(
 ))
 
 /// Blood colors
-#define BLOOD_COLOR_COPPER "#6E3B08"
+//teal oxidized skrell blood - slightly brightened copper oxide hue
+#define BLOOD_COLOR_COPPER "#70B596"
 #define BLOOD_COLOR_NANITE_SLURRY "#CCCCCC"
 //alternate lizard blood
 #define BLOOD_COLOR_GREEN "#339933"

modular_skyrat/modules/customization/_globalvars/lists.dm

@@ -119,7 +119,7 @@ GLOBAL_LIST_INIT(custom_blood_colors, list(
 	"Lime/Xeno" = BLOOD_COLOR_XENO,
 	"Violet/Avali" = BLOOD_COLOR_VIOLET,
 	"Cyan/Vox" = BLOOD_COLOR_CYAN,
-	"Brown/Skrell" = BLOOD_COLOR_COPPER,
+	"Teal/Skrell" = BLOOD_COLOR_COPPER,
 	"White/Nanites" = BLOOD_COLOR_NANITE_SLURRY,
 	"Black" = BLOOD_COLOR_BLACK,
 ))

modular_skyrat/modules/customization/modules/mob/living/carbon/human/species/skrell.dm

@@ -125,7 +125,7 @@
 	desc = "Large black orbs."
 	icon = 'modular_skyrat/modules/organs/icons/skrell_organ.dmi'
 	icon_state = "eyes"
-	flash_protect = FLASH_PROTECTION_SENSITIVE
+	flash_protect = FLASH_PROTECTION_NONE //flash buff given their weakness to brute and cold
 
 /obj/item/organ/lungs/skrell
 	name = "skrell lungs"