Adds a beaker icon to chemical.dm , implements it. Shows when a beaker is inside a chem dispenser

code/modules/reagents/Chemistry-Machinery.dm

@@ -138,7 +138,7 @@
 			var/obj/item/weapon/reagent_containers/glass/B = beaker
 			B.loc = loc
 			beaker = null
-			icon_state = "dispenser"
+			overlays -= "disp_beaker"
 
 	add_fingerprint(usr)
 	return 1 // update UIs attached to this object
@@ -159,7 +159,7 @@
 	B.loc = src
 	user << "You add the beaker to the machine!"
 	nanomanager.update_uis(src) // update all UIs attached to src
-	icon_state = "dispenser_full"
+	overlays += "disp_beaker"
 
 /obj/machinery/chem_dispenser/attack_ai(mob/user as mob)
 	return src.attack_hand(user)