Use GameController::ClearSim in sim.clearSim

Unlike Simulation::clear_sim, this also resets the save info in GameModel, i.e. is equivalent to pressing the 'Erase everything' button.

src/lua/LuaScriptInterface.cpp

@@ -1669,8 +1669,7 @@ int LuaScriptInterface::simulation_decoColor(lua_State * l)
 
 int LuaScriptInterface::simulation_clearSim(lua_State * l)
 {
-	luacon_sim->clear_sim();
-	Client::Ref().ClearAuthorInfo();
+	luacon_controller->ClearSim();
 	return 0;
 }