makes w_class use defines (#9848)

code/modules/telesci/bscrystal.dm

@@ -5,7 +5,7 @@
 	desc = "A glowing bluespace crystal, not much is known about how they work. It looks very delicate."
 	icon = 'icons/obj/telescience.dmi'
 	icon_state = "bluespace_crystal"
-	w_class = 1
+	w_class = ITEMSIZE_TINY
 	origin_tech = list(TECH_BLUESPACE = 4, TECH_MATERIAL = 3)
 	var/blink_range = 8 // The teleport range when crushed/thrown at someone.
 

code/modules/telesci/gps.dm

@@ -5,7 +5,7 @@ var/list/GPS_list = list()
 	desc = "Helping lost spacemen find their way through the planets since 2016."
 	icon = 'icons/obj/telescience.dmi'
 	icon_state = "gps-c"
-	w_class = 2
+	w_class = ITEMSIZE_SMALL
 	slot_flags = SLOT_BELT
 	origin_tech = list(TECH_DATA = 2, TECH_ENGINEERING = 2)
 	var/gps_prefix = "COM"