makes w_class use defines (#9848)

code/modules/games/boardgame.dm

@@ -192,7 +192,7 @@
 	desc = "It is plastic and shiny."
 	icon = 'icons/obj/pieces.dmi'
 	icon_state = "checker_black"
-	w_class = 1
+	w_class = ITEMSIZE_TINY
 	var/piece_color ="black"
 
 /obj/item/checker/Initialize()
@@ -208,7 +208,7 @@
 	desc = "This box holds a nifty portion of checkers."
 	icon_state = "checkers"
 	max_storage_space = 24
-	w_class = 1
+	w_class = ITEMSIZE_TINY
 	can_hold = list(/obj/item/checker)
 
 /obj/item/storage/box/checkers/fill()
@@ -278,7 +278,7 @@
 	desc = "This box holds all the pieces needed for the black side of the chess board."
 	icon_state = "chess_b"
 	max_storage_space = 24
-	w_class = 2
+	w_class = ITEMSIZE_SMALL
 	can_hold = list(/obj/item/checker)
 
 /obj/item/storage/box/chess/fill()

code/modules/games/cards.dm

@@ -4,7 +4,7 @@
 	var/back_icon = "card_back"
 
 /obj/item/deck
-	w_class = 2
+	w_class = ITEMSIZE_SMALL
 	icon = 'icons/obj/playing_cards.dmi'
 	var/list/cards = list()
 
@@ -189,7 +189,7 @@
 	icon_state = "card_pack"
 	drop_sound = 'sound/items/drop/paper.ogg'
 	pickup_sound = 'sound/items/pickup/paper.ogg'
-	w_class = 1
+	w_class = ITEMSIZE_TINY
 	var/list/cards = list()
 
 
@@ -211,7 +211,7 @@
 	icon_state = null
 	drop_sound = 'sound/items/drop/paper.ogg'
 	pickup_sound = 'sound/items/pickup/paper.ogg'
-	w_class = 1
+	w_class = ITEMSIZE_TINY
 
 	var/concealed = 0
 	var/list/cards = list()