definitions.icons: fix unopen-vocab.png.
definitions.icons: fix unopen-vocab.png.

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