Fix find device (wrong EXTRA_ constant used)

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/impl/GBDeviceService.java

@@ -175,7 +175,7 @@ public class GBDeviceService implements DeviceService {
     @Override
     public void onFindDevice(boolean start) {
         Intent intent = createIntent().setAction(ACTION_FIND_DEVICE)
-                .putExtra(EXTRA_APP_UUID, start);
+                .putExtra(EXTRA_FIND_START, start);
         invokeService(intent);
     }