readds a accidentally removed thing

Apparently, someone accidentally removed the functionality of being able to inject beakers in heaters without having to remove them, which is pretty required fore more complex reactions. This readds that.
Also tweaks the Ion release of the zeolite reaction a bit (-0.2 > -0.15)

code/modules/reagents/chemistry/machinery/chem_heater.dm

@@ -83,6 +83,16 @@
 		updateUsrDialog()
 		update_icon()
 		return
+
+	if(beaker)
+		if(istype(I, /obj/item/reagent_containers/dropper))
+			var/obj/item/reagent_containers/dropper/D = I
+			D.afterattack(beaker, user, 1)
+			return
+		if(istype(I, /obj/item/reagent_containers/syringe))
+			var/obj/item/reagent_containers/syringe/S = I
+			S.afterattack(beaker, user, 1)
+			return
 	return ..()
 
 /obj/machinery/chem_heater/on_deconstruction()