LabPlayPanel has redundant constructor args

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Constructor signature is:

function LabPlayPanel( model, ballModeProperty, isBallCapReachedProperty, options )

Call site is:

var playPanel = new LabPlayPanel( model, model.ballModeProperty, model.isBallCapReachedProperty, {...} )

So the ballModeProperty and isBallCapReachedProperty parameters are redundant. And they are in fact used inconsistently in LabPlayPanel's constructor, sometimes using model, sometimes using the redundant parameters. E.g.:

98  if ( model.isBallCapReachedProperty.get() ) {
141 isBallCapReachedProperty.lazyLink( function( isBallCapReached ) {

So I'm going to get rid of the redundant parameters.

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Similar problem with IntroPlayPanel.

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Addressed, closing.