add arrowColor option to demo of MoveToTrashButton, https://github.com/phetsims/scenery-phet/issues/598
add arrowColor option to demo of MoveToTrashButton, https://github.com/phetsims/scenery-phet/issues/598

phetsims/scenery-phet,phetsims/scenery-phet,phetsims/scenery-phet