adds the 'fringe' hair gradient, a hair gradient that gradientizes your fringe (#2803)

## About The Pull Request

adds the 'fringe' hair gradient, a hair gradient that gradientizes your
fringe
## Why It's Good For The Game

customization. good!!!!!!!!!!
## Proof Of Testing


![image](https://github.com/user-attachments/assets/692346ca-8060-4eb0-9bd1-fa5d9d4fc650)

## Changelog
🆑
add: fringe hair gradient
image: fringe hair gradient
/🆑

modular_zubbers/code/modules/mob/dead/new_player/sprite_accessories/hair_gradients.dm

@@ -0,0 +1,6 @@
+// Hair Gradients
+
+/datum/sprite_accessory/gradient/fringe
+	name = "Fringe"
+	icon_state = "fringe"
+	icon = 'modular_zubbers/icons/customization/hair_gradients.dmi'

tgstation.dme

@@ -9133,6 +9133,7 @@
 #include "modular_zubbers\code\modules\mob\dead\new_player\sprite_accessories\fluff.dm"
 #include "modular_zubbers\code\modules\mob\dead\new_player\sprite_accessories\frills.dm"
 #include "modular_zubbers\code\modules\mob\dead\new_player\sprite_accessories\hair.dm"
+#include "modular_zubbers\code\modules\mob\dead\new_player\sprite_accessories\hair_gradients.dm"
 #include "modular_zubbers\code\modules\mob\dead\new_player\sprite_accessories\horns.dm"
 #include "modular_zubbers\code\modules\mob\dead\new_player\sprite_accessories\ipc.dm"
 #include "modular_zubbers\code\modules\mob\dead\new_player\sprite_accessories\skrell_hair.dm"