Move mafia, CTF, and deathmatch maps into minigame folder (#90356)

## About The Pull Request
Repaths all the various minigames to be in the same mapping folder for
organization.

## Why It's Good For The Game
Being able to find maps is nice.

## Changelog
🆑
map: Move mafia, CTF, and deathmatch maps into minigame folder 
/🆑

.github/CODEOWNERS

@@ -175,7 +175,7 @@
 # NamelessFairy
 
 /code/modules/capture_the_flag/ @NamelessFairy
-/_maps/map_files/CTF/ @NamelessFairy
+/_maps/minigame/CTF/ @NamelessFairy
 
 # Pickle-Coding
 

code/modules/capture_the_flag/ctf_map_loading.dm

@@ -67,30 +67,30 @@ GLOBAL_DATUM(ctf_spawner, /obj/effect/landmark/ctf)
 /datum/map_template/ctf/classic
 	name = "Classic"
 	description = "The original CTF map."
-	mappath = "_maps/map_files/CTF/classic.dmm"
+	mappath = "_maps/minigame/CTF/classic.dmm"
 
 /datum/map_template/ctf/four_side
 	name = "Four Side"
 	description = "A CTF map created to demonstrate 4 team CTF, features a single centred flag rather than one per team."
-	mappath = "_maps/map_files/CTF/fourSide.dmm"
+	mappath = "_maps/minigame/CTF/fourSide.dmm"
 
 /datum/map_template/ctf/downtown
 	name = "Downtown"
 	description = "A CTF map that takes place in a terrestrial city."
-	mappath = "_maps/map_files/CTF/downtown.dmm"
+	mappath = "_maps/minigame/CTF/downtown.dmm"
 
 /datum/map_template/ctf/limbo
 	name = "Limbo"
 	description = "A KOTH map that takes place in a wizard den with looping hallways"
-	mappath = "_maps/map_files/CTF/limbo.dmm"
+	mappath = "_maps/minigame/CTF/limbo.dmm"
 	points_to_win = 180
 
 /datum/map_template/ctf/cruiser
 	name = "Crusier"
 	description = "A CTF map that takes place across multiple space ships, one carrying a powerful device that can accelerate those who obtain it"
-	mappath = "_maps/map_files/CTF/cruiser.dmm"
+	mappath = "_maps/minigame/CTF/cruiser.dmm"
 
 /datum/map_template/ctf/turbine
 	name = "Turbine"
 	description = "A CTF map that takes place in a familiar facility. Don't try to hold out mid- There's no sentries in this version."
-	mappath = "_maps/map_files/CTF/turbine.dmm"
+	mappath = "_maps/minigame/CTF/turbine.dmm"

code/modules/deathmatch/deathmatch_maps.dm

@@ -1,5 +1,5 @@
 /datum/lazy_template/deathmatch
-	map_dir = "_maps/deathmatch"
+	map_dir = "_maps/minigame/deathmatch"
 	place_on_top = TRUE
 	turf_reservation_type = /datum/turf_reservation/turf_not_baseturf
 	/// Map UI Name

code/modules/mafia/map_pieces.dm

@@ -36,7 +36,7 @@
 	var/custom_outfit
 
 /datum/map_template/mafia/New(path = null, rename = null, cache = FALSE)
-	path = "_maps/map_files/Mafia/" + map_suffix
+	path = "_maps/minigame/mafia/" + map_suffix
 	return ..()
 
 //we only have one map in unit tests for consistency.