fix Fault command

src/SimulatedE2PS.cpp

@@ -498,7 +498,7 @@ void SimulatedE2PS::fault()
 	/* clang-format on */
 
 	//	Add your own code
-	if (get_state() == Tango::ON) return; // command is idempotent
+	if (get_state() == Tango::FAULT) return; // command is idempotent
 	_current_read = 0.0;
 	_current = 0.0;
 	_voltage = 0.0;