adds digi sprites for cheerleader shoes (#5885)

## About The Pull Request

Title

## Why It's Good For The Game

Lack of digitigrade sprites sucks for people who play characters with
digitigrade legs.

## Proof Of Testing

<img width="130" height="120" alt="Screenshot 2026-07-02 104053"
src="https://github.com/user-attachments/assets/ca64d932-313f-4f83-8e5f-5f6064e73db4"
/>
<img width="132" height="128" alt="Screenshot 2026-07-02 104048"
src="https://github.com/user-attachments/assets/88eaa381-b099-41aa-8bce-89841397cf25"
/>
<img width="138" height="127" alt="Screenshot 2026-07-02 104044"
src="https://github.com/user-attachments/assets/773408e6-3d04-471a-abcb-63d7fc5014d5"
/>

behold
## Changelog
🆑
add: adds digitigrade sprites for the cheerleading shoes
/🆑

Co-authored-by: Cabbage <supredoode@gmail.com>

modular_zubbers/code/modules/GAGS/greyscale_configs.dm

@@ -498,3 +498,6 @@
 	name = "BA Cheerleader Sneakers (Worn)"
 	icon_file = 'modular_zubbers/icons/mob/clothing/under/ba_cheerleader.dmi'
 	json_config = 'modular_zubbers/code/datums/greyscale/json_configs/under/ba_cheerleader/shoes_worn.json'
+
+/datum/greyscale_config/ba_cheerleader_shoes/worn/digi
+	icon_file = 'modular_zubbers/icons/mob/clothing/under/ba_cheerleader_digi.dmi'

modular_zubbers/code/modules/clothing/under/ba_cheerleader.dm

@@ -223,9 +223,11 @@
 	icon_state = "ba_cheerleader_shoes_icon"
 	post_init_icon_state = "ba_cheerleader_shoes"
 	worn_icon = 'modular_zubbers/icons/mob/clothing/under/ba_cheerleader.dmi'
+	worn_icon_digi = 'modular_zubbers/icons/mob/clothing/under/ba_cheerleader_digi.dmi'
 	worn_icon_state = "ba_cheerleader_shoes"
 	greyscale_config = /datum/greyscale_config/ba_cheerleader_shoes
 	greyscale_config_worn = /datum/greyscale_config/ba_cheerleader_shoes/worn
+	greyscale_config_worn_digi = /datum/greyscale_config/ba_cheerleader_shoes/worn/digi
 	greyscale_colors = "#FFFFFF#2980b9"
 	flags_1 = IS_PLAYER_COLORABLE_1