makes w_class use defines (#9848)

code/modules/projectiles/modular/laser_base.dm

@@ -139,7 +139,7 @@
 /obj/item/device/laser_assembly
 	name = "laser assembly (small)"
 	desc = "A case for shoving things into. Hopefully they work."
-	w_class = 2
+	w_class = ITEMSIZE_SMALL
 	icon = 'icons/obj/guns/modular_laser.dmi'
 	var/base_icon_state = "small"
 	contained_sprite = TRUE

code/modules/projectiles/modular/laser_components.dm

@@ -3,21 +3,21 @@
 /obj/item/device/laser_assembly/medium
 	name = "laser assembly (medium)"
 	base_icon_state = "medium"
-	w_class = 3
+	w_class = ITEMSIZE_NORMAL
 	size = CHASSIS_MEDIUM
 	modifier_cap = 4
 
 /obj/item/device/laser_assembly/large
 	name = "laser assembly (large)"
 	base_icon_state = "large"
-	w_class = 4
+	w_class = ITEMSIZE_LARGE
 	size = CHASSIS_LARGE
 	modifier_cap = 5
 
 /obj/item/device/laser_assembly/admin
 	name = "laser assembly (obscene)"
 	base_icon_state = "large"
-	w_class = 4
+	w_class = ITEMSIZE_LARGE
 	size = CHASSIS_LARGE
 	modifier_cap = 25