Improve tray icon with only showing current desktop number

[MihaMarkic]

Currently tray icon is showing both current desktop number and total desktops count. I'd prefer only current number as it would be bigger and thus more visible, while count is not necessary IMO.

[MihaMarkic]

Can create a PR if this is ok. I can imagine just getting rid of total count or create a settings to choose whether to display it or not. Which one would be ok?

[ViRb3]

I'm happy to take a PR for this.