(svn r10015) -Fix: one could build (only) tram tracks when that was the last built roadtype (in a normal game).

src/road_gui.cpp

@@ -454,6 +454,7 @@ static const WindowDesc _build_road_scen_desc = {
 
 void ShowBuildRoadScenToolbar()
 {
+	_cur_roadtype = ROADTYPE_ROAD;
 	AllocateWindowDescFront(&_build_road_scen_desc, 0);
 }