remove ActivityDatePersister from services.yaml
remove ActivityDatePersister from services.yaml

usu/ecamp3,ecamp/ecamp3,ecamp/ecamp3,ecamp/ecamp3,pmattmann/ecamp3,usu/ecamp3,usu/ecamp3,pmattmann/ecamp3,pmattmann/ecamp3,pmattmann/ecamp3,usu/ecamp3,ecamp/ecamp3