makes w_class use defines (#9848)

code/game/objects/items/weapons/implants/implant.dm

@@ -6,7 +6,7 @@
 	name = "implant"
 	icon = 'icons/obj/device.dmi'
 	icon_state = "implant"
-	w_class = 1
+	w_class = ITEMSIZE_TINY
 	var/implanted = null
 	var/mob/imp_in = null
 	var/obj/item/organ/external/part = null

code/game/objects/items/weapons/implants/implantcase.dm

@@ -8,7 +8,7 @@
 	item_state = "implantcase"
 	throw_speed = 1
 	throw_range = 5
-	w_class = 1.0
+	w_class = ITEMSIZE_TINY
 	var/obj/item/implant/imp = null
 
 /obj/item/implantcase/proc/update()

code/game/objects/items/weapons/implants/implanter.dm

@@ -9,7 +9,7 @@
 	item_state = "syringe_0"
 	throw_speed = 1
 	throw_range = 5
-	w_class = 2.0
+	w_class = ITEMSIZE_SMALL
 	matter = list(DEFAULT_WALL_MATERIAL = 320, MATERIAL_GLASS = 800)
 	var/obj/item/implant/imp = null
 
@@ -232,4 +232,4 @@
 		user.drop_from_inventory(I, src)
 		update()
 		return
-	..()
+	..()

code/game/objects/items/weapons/implants/implantpad.dm

@@ -8,7 +8,7 @@
 	item_state = "electronic"
 	throw_speed = 1
 	throw_range = 5
-	w_class = 2.0
+	w_class = ITEMSIZE_SMALL
 	var/obj/item/implantcase/case = null
 	var/broadcasting = null
 	var/listening = TRUE