OZG-6721 OZG-6914 Call repository in SettingsService

...ationseinheit/OrganisationsEinheitSettingsRepository.java

...nisationseinheit/OrganisationsEinheitSettingsService.java

...rganisationseinheit/OrganisationsEinheitWithSettings.java

.../organisationseinheit/OrganisationsEinheitRepository.java

src/main/java/de/ozgcloud/admin/setting/SettingService.java

...einheit/OrganisationsEinheitSettingsRepositoryITCase.java

...tionseinheit/OrganisationsEinheitSettingsServiceTest.java

...isationseinheit/OrganisationsEinheitRepositoryITCase.java