Update adurosmart.ts with AduroSmart ERIA Siren 81868

[jvanderzande]

Update adurosmart.ts with AduroSmart ERIA Siren 81868 as discusssed here: https://github.com/search?q=repo%3AKoenkk%2Fzigbee2mqtt+81868&type=issues

[Koenkk]

Thanks!

Could you also submit a picture for the docs? This can be done by:

1. Create a fork by clicking here
2. Go to the public/images/devices directory, Add file -> Upload files
3. Upload the files and press Commit changes
4. Press Contribute -> Open pull request -> update title/description -> Create pull request

Make sure that:

• The filename is 81868.png
• The size is 512x512
• The background is transparent (use e.g. Adobe remove background)

[jvanderzande]

Could you also submit a picture for the docs? This can be done by:

Just created the PR. hope the image is good enough as the original was 150x150, so I enlarged it to 512x512.
EDIT: Committed a better quality image.

Cheer, Jos