Cleanup up all instances of using var/ definitions in proc parameters. (#52728)

* var/list cleanup

* The rest of the owl

* plushvar bad

* Can't follow my own advice.

code/controllers/subsystem/mapping.dm

@@ -366,7 +366,7 @@ GLOBAL_LIST_EMPTY(the_station_areas)
 		maprotate()
 	SSvote.initiate_vote("map", "automatic map rotation")
 
-/datum/controller/subsystem/mapping/proc/changemap(var/datum/map_config/VM)
+/datum/controller/subsystem/mapping/proc/changemap(datum/map_config/VM)
 	if(!VM.MakeNextMap())
 		next_map_config = load_map_config(default_to_box = TRUE)
 		message_admins("Failed to set new map with next_map.json for [VM.map_name]! Using default as backup!")

code/controllers/subsystem/pai.dm

@@ -130,7 +130,7 @@ SUBSYSTEM_DEF(pai)
 /datum/controller/subsystem/pai/proc/spam_again()
 	ghost_spam = FALSE
 
-/datum/controller/subsystem/pai/proc/check_ready(var/datum/pai_candidate/C)
+/datum/controller/subsystem/pai/proc/check_ready(datum/pai_candidate/C)
 	if(!C.ready)
 		return FALSE
 	for(var/mob/dead/observer/O in GLOB.player_list)

code/controllers/subsystem/pathfinder.dm

@@ -18,7 +18,7 @@ SUBSYSTEM_DEF(pathfinder)
 	var/free
 	var/list/flow
 
-/datum/flowcache/New(var/n)
+/datum/flowcache/New(n)
 	. = ..()
 	lcount = n
 	run = 0