commander: lockdown is not termination

We use lockdown to prevent outputs like motors and servos from being
active in HITL simulation. This means that we can't treat the lockdown
flag as a flight_terminated, otherwise we can't arm in HITL at all.

src/modules/commander/Commander.cpp

@@ -2929,7 +2929,7 @@ Commander::run()
 			checkWindSpeedThresholds();
 		}
 
-		_status_flags.flight_terminated = _armed.force_failsafe || _armed.lockdown || _armed.manual_lockdown;
+		_status_flags.flight_terminated = _armed.force_failsafe || _armed.manual_lockdown;
 
 		/* Get current timestamp */
 		const hrt_abstime now = hrt_absolute_time();