hue: add execute permission to stop-hue-server.sh

[kpgtek]

Which issue(s) this PR fixes

Fixes #137

Additional comments

We need to change the script stop-hue-server.sh permission to 755, to avoid failed error with systemctl status hue after restarting or stopping the service.

Agreements

• [x] I hereby declare this contribution to be licensed under the Apache License Version 2.0, January 2004.
• [x] I hereby agree to grant TOSIT a copyright license to use my contributions.