Fix text filter in dual-pane purchase window with GRF custom names

src/build_vehicle_gui.cpp

@@ -2574,7 +2574,8 @@ struct BuildVehicleWindowTrainAdvanced final : BuildVehicleWindowBase {
 
 		/* Filter engine name */
 		state.string_filter.ResetState();
-		state.string_filter.AddLine(GetString(e->info.string_id));
+		SetDParam(0, PackEngineNameDParam(e->index, EngineNameContext::PurchaseList));
+		state.string_filter.AddLine(GetString(STR_ENGINE_NAME));
 
 		/* Filter NewGRF extra text */
 		auto text = GetNewGRFAdditionalText(e->index);