[BUGFIX] adjusted to new variables

__Tasks:__

- [x] test coverage
- [ ] gather feedback for my changes
- [x] submit changes to the documentation

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | none
| BC Breaks     | Changed Twig variable structure
| Doc           | https://github.com/sulu-cmf/docs/blob/master/developer-documentation/300-webspaces/templates.md