train-draw: remove blocks.extras and Plot dependency
train-draw: remove blocks.extras and Plot dependency

Since the Plot call is disabled, let's also remove
the dependency since it's not clear how to install
blocks.extras to get this back.

langholz/draw,drewlinsley/draw_classify,dribnet/draw,mohammadpz/draw,drewlinsley/draw_classify,jbornschein/draw,drewlinsley/draw_classify,negar-rostamzadeh/draw,ablavatski/draw