ui.gadgets.worlds: revert back to 1 track-add.
ui.gadgets.worlds: revert back to 1 track-add.

mrjbq7/factor,bpollack/factor,AlexIljin/factor,AlexIljin/factor,tgunr/factor,factor/factor,factor/factor,bpollack/factor,bpollack/factor,tgunr/factor,AlexIljin/factor,factor/factor,AlexIljin/factor,mrjbq7/factor,AlexIljin/factor,bpollack/factor,factor/factor,AlexIljin/factor,factor/factor,tgunr/factor,tgunr/factor,mrjbq7/factor,bpollack/factor,bpollack/factor,factor/factor,tgunr/factor,mrjbq7/factor,mrjbq7/factor,AlexIljin/factor,tgunr/factor,bpollack/factor,mrjbq7/factor