DetectionSensor: broadcast all state changes

Closes #4753

src/modules/DetectionSensorModule.h

@@ -15,6 +15,7 @@ class DetectionSensorModule : public SinglePortModule, private concurrency::OSTh
   private:
     bool firstTime = true;
     uint32_t lastSentToMesh = 0;
+    bool wasDetected = false;
     void sendDetectionMessage();
     void sendCurrentStateMessage();
     bool hasDetectionEvent();