fixed event renaming issue


- [x] test coverage
- [x] finish the code
- [ ] gather feedback for my changes
- [ ] submit changes to the documentation


| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tests pass?   | yes
| Fixed tickets | yes
| Doc           | none

fixed https://github.com/sulu-cmf/SuluSecurityBundle/issues/48