add SIM_PARAM_UPDATE_DELTA_TIME flag to fix setting the time step

in shared memory API

examples/SharedMemory/PhysicsClientC_API.cpp

@@ -95,6 +95,7 @@ int	b3PhysicsParamSetTimeStep(b3SharedMemoryCommandHandle commandHandle, double
 {
     struct SharedMemoryCommand* command = (struct SharedMemoryCommand*) commandHandle;
 	b3Assert(command->m_type == CMD_SEND_PHYSICS_SIMULATION_PARAMETERS);
+	command->m_updateFlags |= SIM_PARAM_UPDATE_DELTA_TIME;	
 	command->m_physSimParamArgs.m_deltaTime = timeStep;
 	return 0;
 }