Fixes living food / creature hybrids not grabbing ghosts or storing brains. (#93405)

## About The Pull Request

This PR fixes a long standing issue where food creatures created with
player brains did not work correctly, due to their code checking for the
brain within their contents, where it was absent.

It also stores the heart used in contents for consistency. 

## Why It's Good For The Game

It lets people enjoy playing as these wonderous creatures, and lets
these strange beasts be revived when destroyed with proper veterinary or
culinary intervention.

## Changelog

🆑
fix: food / animal hybrids like the butterbear and cak now once again
correctly grab ghosts and store brains.
/🆑

code/modules/food_and_drinks/recipes/tablecraft/recipes_bread.dm

@@ -165,6 +165,10 @@
 		/datum/reagent/blood = 30,
 		/datum/reagent/teslium = 1 //To shock the whole thing into life
 	)
+	parts = list(
+		/obj/item/organ/brain,
+		/obj/item/organ/heart
+	)
 	result = /mob/living/basic/pet/dog/breaddog
 	category = CAT_BREAD
 

code/modules/food_and_drinks/recipes/tablecraft/recipes_cake.dm

@@ -234,6 +234,10 @@
 		/datum/reagent/consumable/sprinkles = 5,
 		/datum/reagent/teslium = 1 //To shock the whole thing into life
 	)
+	parts = list(
+		/obj/item/organ/brain,
+		/obj/item/organ/heart
+	)
 	result = /mob/living/basic/pet/cat/cak
 	category = CAT_CAKE //Cat! Haha, get it? CAT? GET IT? We get it - Love Felines
 

code/modules/food_and_drinks/recipes/tablecraft/recipes_misc.dm

@@ -170,6 +170,10 @@
 		/datum/reagent/blood = 50,
 		/datum/reagent/teslium = 1 //To shock the whole thing into life
 	)
+	parts = list(
+		/obj/item/organ/brain,
+		/obj/item/organ/heart
+	)
 	result = /mob/living/basic/bear/butter
 	category = CAT_MISCFOOD