[MIRROR] Halloween tile decals [MDB IGNORE] (#24484)

* Halloween tile decals (#79108)

## About The Pull Request

Adds orange and black tile decals for the Halloween holiday.

<details>
<summary>Screenshot</summary>

![image](https://github.com/tgstation/tgstation/assets/83487515/36ac0d48-fe89-4f15-b9f7-bc55cb0f0de1)

![image](https://github.com/tgstation/tgstation/assets/83487515/fa409d3e-004e-45e3-97b3-05f9244fbf13)

</details>

## Why It's Good For The Game

It's Halloween, compliment the visual filter recently added to the
holiday.

## Changelog

:cl: LT3
image: Added Halloween themed floor/tram tiles
/:cl:

* Halloween tile decals

---------

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

code/modules/holiday/holidays.dm

@@ -555,6 +555,7 @@
 	begin_month = OCTOBER
 	end_day = 2
 	end_month = NOVEMBER
+	holiday_colors = list(COLOR_MOSTLY_PURE_ORANGE, COLOR_PRISONER_BLACK)
 
 /datum/holiday/halloween/greet()
 	return "Have a spooky Halloween!"