Fix missing sound_hand declaration

misc_functions.lua

@@ -151,6 +151,8 @@ local tool = {
 	end,
 }
 
+local sound_handle
+
 tool.on_use = function(stack, user, pointed_thing)
 	if not user:is_player() then return end
 

tools.lua

@@ -9,8 +9,6 @@ local S = core.get_translator(cleaner.modname)
 
 local aux = dofile(cleaner.modpath .. "/misc_functions.lua")
 
-local sound_handle
-
 --- Master Pencil
 --
 --  @tool cleaner:pencil