Replace explicit z-level checks with defines

code/modules/events/wizard/curseditems.dm

@@ -38,7 +38,7 @@
 			ruins_wizard_loadout = 1
 
 	for(var/mob/living/carbon/human/H in GLOB.alive_mob_list)
-		if(ruins_spaceworthiness && !(H.z in GLOB.station_z_levels) || isspaceturf(H.loc) || isplasmaman(H))
+		if(ruins_spaceworthiness && !is_station_level(H.z) || isspaceturf(H.loc) || isplasmaman(H))
 			continue	//#savetheminers
 		if(ruins_wizard_loadout && iswizard(H))
 			continue

code/modules/events/wizard/greentext.dm

@@ -58,7 +58,7 @@
 	..()
 
 /obj/item/greentext/process()
-	if(new_holder && new_holder.z == ZLEVEL_CENTCOM)//you're winner!
+	if(new_holder && is_centcom_level(new_holder.z))//you're winner!
 		to_chat(new_holder, "<font color='green'>At last it feels like victory is assured!</font>")
 		if(!(new_holder in SSticker.mode.traitors))
 			SSticker.mode.traitors += new_holder.mind

code/modules/events/wizard/petsplosion.dm

@@ -8,7 +8,7 @@
 
 /datum/round_event_control/wizard/petsplosion/preRunEvent()
 	for(var/mob/living/simple_animal/F in GLOB.alive_mob_list)
-		if(!ishostile(F) && (F.z in GLOB.station_z_levels))
+		if(!ishostile(F) && is_station_level(F.z))
 			mobs_to_dupe++
 	if(mobs_to_dupe > 100 || !mobs_to_dupe)
 		return EVENT_CANT_RUN
@@ -24,7 +24,7 @@
 	if(activeFor >= 30 * countdown) // 0 seconds : 2 animals | 30 seconds : 4 animals | 1 minute : 8 animals
 		countdown += 1
 		for(var/mob/living/simple_animal/F in GLOB.alive_mob_list) //If you cull the heard before the next replication, things will be easier for you
-			if(!ishostile(F) && (F.z in GLOB.station_z_levels))
+			if(!ishostile(F) && is_station_level(F.z))
 				new F.type(F.loc)
 				mobs_duped++
 				if(mobs_duped > 400)

code/modules/events/wizard/shuffle.dm

@@ -13,7 +13,7 @@
 	var/list/mobs	 = list()
 
 	for(var/mob/living/carbon/human/H in GLOB.alive_mob_list)
-		if(!(H.z in GLOB.station_z_levels))
+		if(!is_station_level(H.z))
 			continue //lets not try to strand people in space or stuck in the wizards den
 		moblocs += H.loc
 		mobs += H