Changed store to use a single function

expcore/gui/test.lua

@@ -652,7 +652,7 @@ Event.add(defines.events.on_tick,function()
     progressbar_one:increment()
     progressbar_three:decrement()
     local categories = Store.get_children(progressbar_two.store)
-    for category,_ in pairs(categories) do
+    for _,category in pairs(categories) do
         progressbar_two:increment(1,category)
     end
 end)