Revert "[MIRROR] Replace all secondary flags with bitflags stored in the flags_2 var" (#2457)

ok you know what yeah i think i'll properly mirror https://github.com/Citadel-Station-13/Citadel-Station-13/pull/2411

code/modules/holodeck/items.dm

@@ -204,7 +204,7 @@
 	eventstarted = TRUE
 
 	for(var/obj/structure/window/W in currentarea)
-		if(W.flags_1&NODECONSTRUCT_1) // Just in case: only holo-windows
+		if(W.flags&NODECONSTRUCT) // Just in case: only holo-windows
 			qdel(W)
 
 	for(var/mob/M in currentarea)