[Not Modular] Drifting contractor adjustments (#667)

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## About The Pull Request
Removes the duplicate contractor event, and makes it so there can only
be one contractor spawn at a time.
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## Why It's Good For The Game
Contractors are easily able to fight off the entire security team,
especially when left to fester. This removes the duplicate event so
spawns can actually be controlled via config, and makes it so only one
contractor can spawn at a given time.
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## Changelog

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🆑
del: extra contractors
/🆑

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---------

Co-authored-by: StrangeWeirdKitten <95130227+StrangeWeirdKitten@users.noreply.github.com>

modular_skyrat/modules/contractor/code/datums/midround/event.dm

@@ -1,4 +1,4 @@
-/datum/round_event_control/contractor
+/*/datum/round_event_control/contractor
 	name = "Drifting Contractor"
 	typepath = /datum/round_event/ghost_role/contractor
 	weight = 8
@@ -37,4 +37,4 @@
 	message_admins("[ADMIN_LOOKUPFLW(operative)] has been made into [src] by an event.")
 	log_game("[key_name(operative)] was spawned as a [src] by an event.")
 	spawned_mobs += operative
-	return SUCCESSFUL_SPAWN
+	return SUCCESSFUL_SPAWN*/ //BUBBER EDIT: REMOVES THE EXTRA CONTRACTOR EVENT

modular_skyrat/modules/contractor/code/datums/midround/ruleset.dm

@@ -20,8 +20,10 @@
 	var/list/spawn_locs = list()
 
 /datum/dynamic_ruleset/midround/from_ghosts/contractor/ready(forced = FALSE)
-	if(prob(33))
-		required_candidates++
+	//BUBBER EDIT: LESS CONTRACTORS
+	//if(prob(33))
+	//	required_candidates++
+	//BUBBER EDIT: LESS CONTRACTORS
 	if (required_candidates > (length(dead_players) + length(list_observers)))
 		return FALSE
 	for(var/obj/effect/landmark/carpspawn/carp in GLOB.landmarks_list)