Remove out-of-date comments in view-map

cmd/view-map/main.go

@@ -137,8 +137,6 @@ func cellToVec(x, y int) pixel.Rect {
 	return pixel.Rect{Min: min, Max: max}
 }
 
-// TODO: cut this down to showing just the viewport?
-// The naive approach using gameMap.Width() / Height() cuts half the map off :/
 func present(win *pixelgl.Window, state *runState) {
 	gameMap := state.env.gameMap
 	imd := imdraw.New(nil)