community/xfce4-wavelan-plugin: upgrade to 0.6.3

https://docs.xfce.org/panel-plugins/xfce4-wavelan-plugin/start#latest_release

Release notes for 0.6.3
=======================
- Fix intltool lock file bug in make distcheck
- Fix read_config memory leaks
- Add option to execute command on icon click (!9)
- Add option to hide signal bar (!8)
- Prefer symbolic icons and fix icon color (!7)
- Icon now shows signal strength(!5)
- remove bogus close function
- autoconf: Some updates
- Translation Updates