fixes chair dismantling being reversed (#12841)

Co-authored-by: TGW <mc-casper@hotmail.dk>
Co-authored-by: Werner <1331699+Arrow768@users.noreply.github.com>

code/game/objects/structures/stool_bed_chair_nest/bed.dm

@@ -213,7 +213,7 @@
 /obj/structure/bed/dismantle(obj/item/W, mob/user)
 	playsound(src.loc, W.usesound, 50, 1)
 	user.visible_message("<b>[user]</b> begins dismantling \the [src].", SPAN_NOTICE("You begin dismantling \the [src]."))
-	if(!do_after(user, 20 / W.toolspeed))
+	if(do_after(user, 20 / W.toolspeed))
 		user.visible_message("\The [user] dismantles \the [src].", SPAN_NOTICE("You dismantle \the [src]."))
 		if(padding_material)
 			padding_material.place_sheet(get_turf(src))

html/changelogs/ChairDismantle.yml

@@ -0,0 +1,6 @@
+author: TheGreyWolf
+
+delete-after: True
+
+changes:
+  - bugfix: "Beds and chairs can now be properly dismantled again."