A possible fix for missing icon in systray.

Running debian-stable.

I left a possible fix in issue #745, #761, #831, #971, etc...
Had an idea It could be a themes issue, so i tried different theme settings and the SSR tray indicator came back when i Have set all ticks checked in menus and buttons tab.
I know some of you don't aren't running Xfce but try messing around with the theme settings an see if that helps.
I first posted in #761 on this discovery.