Handling of HFNose in HGCalTriggerTools::layers

[jbsauvan]

Handling of HFNose in HGCalTriggerTools::layers to be improved.
Could the two layers methods be merged? Currently HFNose not handled by:

cmssw/L1Trigger/L1THGCal/src/HGCalTriggerTools.cc

Lines 91 to 111 in 1b91931

	unsigned HGCalTriggerTools::layers(DetId::Detector type) const {
	unsigned layers = 0;
	switch (type) {
	case DetId::HGCalEE:
	layers = eeLayers_;
	break;
	case DetId::HGCalHSi:
	layers = fhLayers_;
	break;
	case DetId::HGCalHSc:
	layers = bhLayers_;
	break;
	// FIXME: to do HFNose
	case DetId::Forward:
	layers = totalLayers_;
	break;
	default:
	break;
	}
	return layers;
	}