Use a lower resort interval in veh windows when sorting by timetable delay

src/group_gui.cpp

@@ -1032,6 +1032,7 @@ public:
 
 			case WID_GL_SORT_BY_DROPDOWN:
 				this->vehgroups.SetSortType(index);
+				this->UpdateSortingInterval();
 				break;
 			case WID_GL_FILTER_BY_CARGO: // Select a cargo filter criteria
 				this->SetCargoFilterIndex(index);