fix: minor visual bug fixes after angular 15 migration
Created by: xflord
- added user style to defaultConfig.json in apps it was missing, since it now won't load without it
- fixed mailing lists checkbox misalignment
- added the visibility icon to the form field in settings-samba-password.component
- fixed a bug that made password form jump when spinner was visible (global spinner margin was removed, it was added just for a slight visual change, I believe we can do without it)