Fixed state management in SNAP command

src/SpectrometerTask.cpp

@@ -249,6 +249,8 @@ void SpectrometerTask::snap( size_t tmo_ms )
 {
   try
   {
+    m_cfg.host_device->set_state(Tango::RUNNING);
+
     //- synchronous approach: "post then wait for the message to be handled"
     if( tmo_ms )
       wait_msg_handled(kSNAP_ACQ_MSG, tmo_ms);