Fixed xdg-data-dirs issue

modules/xdg_data.lua

@@ -16,7 +16,7 @@ menu_utils.wm_name = ""
 local desktop_dirs = {}
 local desktop_dirs_complete = 0
 local icon_dirs = {}
-((os.getenv("XDG_DATA_DIRS") or 
+((table.concat(gears.filesystem.get_xdg_data_dirs(),":") or 
  "/usr/share:/usr/local/share")..":"..os.getenv("HOME").."/.local/share"):gsub("[^:]*",function(path)
     if gears.filesystem.dir_readable(path.."/applications") then
         table.insert(desktop_dirs, path.."/applications")