modalBehaviors.transitVehicleTypeVOTMultipliers does not behave as expected

[wrashid]

somewhat related issue: In class PopulationAttributes.scala we only use this parameter, if used by a single mode, however, it could be generalized to multiple modes (not perfect, but better):

        val modeMultiplier = getModeVotMultiplier(Option(embodiedBeamLeg.beamLeg.mode), modeChoiceModel)
        val beamVehicleTypes = embodiedBeamTrip.beamLegs.map(_.mode).toSet.map(mode => TransitVehicleInitializer.transitModeToBeamVehicleType(mode))
        val vehicleTypeVOTMultipliers=beamVehicleTypes.map(beamVehicleTypeId=>modeChoiceModel.transitVehicleTypeVOTMultipliers.getOrElse(beamVehicleTypeId, modeMultiplier))
        val multiplier = vehicleTypeVOTMultipliers.sum / vehicleTypeVOTMultipliers.size