Check autostart feature

It looks like autostart.Enable() in pkg/backend/init.go is never called. The function should place a file to ~/.config/autostart/something.desktop
It' in the else branch of if conf.SkipLaunch || conf.DisableAutostart . It looks like conf.SkipLaunch comes from the providers json, but it's not there... Also DisableAutostart is always true, regardles of the DisableAutostart value in the config file systray.json.

Need to investigate, but don't want to spend time on this now...