Adds button and switch sounds when using machinery (#8195)

code/modules/reagents/Chemistry-Machinery.dm

@@ -14,6 +14,8 @@
 	use_power = 1
 	idle_power_usage = 20
 	layer = 2.9
+	clicksound = "button"
+	
 	var/beaker = null
 	var/obj/item/storage/pill_bottle/loaded_pill_bottle = null
 	var/mode = TRUE

code/modules/reagents/dispenser/dispenser2.dm

@@ -2,6 +2,7 @@
 	name = "chemical dispenser"
 	icon = 'icons/obj/chemical.dmi'
 	icon_state = "dispenser"
+	clicksound = "button"
 
 	var/list/spawn_cartridges = null // Set to a list of types to spawn one of each on New()