Fix Lua global leaks

Fix unintended leaked globals in the clusterio and player_auth modules.

packages/slave/modules/clusterio/serialize.lua

@@ -11,7 +11,7 @@ local function version_to_table(version)
 end
 
 -- 0.17 compatibility
-local supports_bar, get_bar, has_bar, version
+local supports_bar, get_bar, set_bar, version
 if (pcall(function() local mods = script.active_mods end)) then
 	supports_bar = "supports_bar"
 	get_bar = "get_bar"

plugins/player_auth/module/auth.lua

@@ -1,7 +1,7 @@
 local clusterio_api = require("modules/clusterio/api")
 local auth = {}
 
-function open_dialog(player, url, code)
+local function open_dialog(player, url, code)
 	if player.gui.screen.player_auth_dialog then
 		player.gui.screen.player_auth_dialog.destroy()
 	end