[MIRROR] Adds logic to regal rat butchering, will now produce mouse meat. [MDB IGNORE] (#19688)

* Adds logic to regal rat butchering, will now produce mouse meat. (#73715)

## About The Pull Request

Okay, I had fun with the alert system. Simply, this just adds 2 meat to
the butcher completion of regal rats. It's a pretty low amount of meat
considering that they look like this.

![dumpyrat](https://user-images.githubusercontent.com/16896032/222053444-2218b35d-e3f1-45bd-800b-53f2c6d94a4f.gif)

I chose a low number for the meat considering that players will still be
able to get a massive influx of meat from butchering the small rats.

## Why It's Good For The Game

Regal Rats are often dragged to the kitchen immediately upon being
killed, leaving confused chefs/assistants wondering why they only
received a crown upon successful butchering. Hopefully, this change will
leave people less baffled by the lack of meatiness from the huge
creatures.

## Changelog

🆑
qol: Regal Rats produce meat on butchering, reducing player confusion.
/🆑

* Adds logic to regal rat butchering, will now produce mouse meat.

---------

Co-authored-by: carshalash <carshalash@gmail.com>

code/modules/mob/living/simple_animal/hostile/regalrat.dm

@@ -12,7 +12,7 @@
 	see_in_dark = 15
 	lighting_alpha = LIGHTING_PLANE_ALPHA_MOSTLY_VISIBLE
 	obj_damage = 10
-	butcher_results = list(/obj/item/clothing/head/costume/crown = 1,)
+	butcher_results = list(/obj/item/food/meat/slab/mouse = 2, /obj/item/clothing/head/costume/crown = 1)
 	response_help_continuous = "glares at"
 	response_help_simple = "glare at"
 	response_disarm_continuous = "skoffs at"