Unecessary MQTT messages when door is unlocked 

Spams islocked: false because we think that the state changed
Most clearly seen when using holdopen_button function.

```
doors/dlock-1/islocked false
doors/dlock-1/islocked false
doors/dlock-1/islocked false
doors/dlock-1/islocked false
doors/dlock-1/islocked false
```
