Clean up some admin-transform related code (#40890)

1. there was an option for cancel when the input already had a cancel button
2. hitting either of these cancels did nothing, and it continued on with the
   transformation
3. there were some 1's and 0's that shoulda been TRUE and FALSE

code/modules/admin/topic.dm

@@ -438,12 +438,12 @@
 			to_chat(usr, "This can only be used on instances of type /mob.")
 			return
 
-		var/delmob = 0
+		var/delmob = FALSE
 		switch(alert("Delete old mob?","Message","Yes","No","Cancel"))
 			if("Cancel")
 				return
 			if("Yes")
-				delmob = 1
+				delmob = TRUE
 
 		log_admin("[key_name(usr)] has used rudimentary transformation on [key_name(M)]. Transforming to [href_list["simplemake"]].; deletemob=[delmob]")
 		message_admins("<span class='adminnotice'>[key_name_admin(usr)] has used rudimentary transformation on [key_name_admin(M)]. Transforming to [href_list["simplemake"]].; deletemob=[delmob]</span>")
@@ -464,6 +464,8 @@
 				M.change_mob_type( /mob/living/carbon/alien/larva , null, null, delmob )
 			if("human")
 				var/posttransformoutfit = usr.client.robust_dress_shop()
+				if (!posttransformoutfit)
+					return
 				var/mob/living/carbon/human/newmob = M.change_mob_type( /mob/living/carbon/human , null, null, delmob )
 				if(posttransformoutfit && istype(newmob))
 					newmob.equipOutfit(posttransformoutfit)

code/modules/admin/verbs/debug.dm

@@ -755,7 +755,7 @@ GLOBAL_PROTECT(AdminProcCallSpamPrevention)
 	message_admins("<span class='adminnotice'>[key_name_admin(usr)] changed the equipment of [ADMIN_LOOKUPFLW(H)] to [dresscode].</span>")
 
 /client/proc/robust_dress_shop()
-	var/list/outfits = list("Cancel","Naked","Custom","As Job...")
+	var/list/outfits = list("Naked","Custom","As Job...")
 	var/list/paths = subtypesof(/datum/outfit) - typesof(/datum/outfit/job)
 	for(var/path in paths)
 		var/datum/outfit/O = path //not much to initalize here but whatever
@@ -769,9 +769,6 @@ GLOBAL_PROTECT(AdminProcCallSpamPrevention)
 	if (outfits[dresscode])
 		dresscode = outfits[dresscode]
 
-	if(dresscode == "Cancel")
-		return
-
 	if (dresscode == "As Job...")
 		var/list/job_paths = subtypesof(/datum/outfit/job)
 		var/list/job_outfits = list()

code/modules/mob/mob_transformation_simple.dm

@@ -2,7 +2,7 @@
 //This proc is the most basic of the procs. All it does is make a new mob on the same tile and transfer over a few variables.
 //Returns the new mob
 //Note that this proc does NOT do MMI related stuff!
-/mob/proc/change_mob_type(new_type = null, turf/location = null, new_name = null as text, delete_old_mob = 0 as num)
+/mob/proc/change_mob_type(new_type = null, turf/location = null, new_name = null as text, delete_old_mob = FALSE)
 
 	if(isnewplayer(src))
 		to_chat(usr, "<span class='danger'>Cannot convert players who have not entered yet.</span>")