Fix high security door material exploit, tweaks cost (#43035)

Fixes an exploit that allowed for infinite metal/plasteel to be farmed off of
high security/vault door deconstruction. Makes completed airlock assemblies
start with no wire security and adjusts the material costs of both doors
accordingly. As the high security airlock was fortified with normal metal
unlike the vault door this is a slight buff to it, but I am fairly sure it
will not affect the game balance noticeably.

code/game/objects/structures/door_assembly.dm

@@ -241,6 +241,7 @@
 				//door.req_access = req_access
 				door.electronics = electronics
 				door.heat_proof = heat_proof_finished
+				door.security_level = 0
 				if(electronics.one_access)
 					door.req_one_access = electronics.accesses
 				else

code/game/objects/structures/door_assembly_types.dm

@@ -114,7 +114,7 @@
 	airlock_type = /obj/machinery/door/airlock/highsecurity
 	noglass = TRUE
 	material_type = /obj/item/stack/sheet/plasteel
-	material_amt = 6
+	material_amt = 4
 
 /obj/structure/door_assembly/door_assembly_vault
 	name = "vault door assembly"
@@ -124,7 +124,7 @@
 	airlock_type = /obj/machinery/door/airlock/vault
 	noglass = TRUE
 	material_type = /obj/item/stack/sheet/plasteel
-	material_amt = 8
+	material_amt = 6
 
 /obj/structure/door_assembly/door_assembly_shuttle
 	name = "shuttle airlock assembly"