robot-simulator: remove "robot"
robot-simulator: remove "robot"

"robot" deemed unnecessary, replaced by "input".
ErikSchierboom/x-common,jmluy/x-common,petertseng/x-common,rpottsoh/x-common,rpottsoh/x-common,exercism/x-common,jmluy/x-common,petertseng/x-common,ErikSchierboom/x-common,exercism/x-common,jmluy/x-common