Fix: Add Tunnel polygons to BBox calculation

CityDoctorParent/Extensions/CityDoctorGUI/src/main/java/de/hft/stuttgart/citydoctor2/gui/TriangulatedGeometry.java

@@ -86,6 +86,7 @@ public class TriangulatedGeometry {
 
 		addPolygonDataFromCityObjects(model.getBuildings(), triGeom, Color.WHITE, filters);
 		addPolygonDataFromCityObjects(model.getBridges(), triGeom, Color.CORAL, filters);
+		addPolygonDataFromCityObjects(model.getTunnels(), triGeom, Color.SLATEGRAY, filters);
 		addPolygonDataFromCityObjects(model.getLand(), triGeom, Color.BROWN, filters);
 		addPolygonDataFromCityObjects(model.getTransportation(), triGeom, Color.YELLOW, filters);
 		addPolygonDataFromCityObjects(model.getVegetation(), triGeom, Color.LIGHTGREEN, filters);