Remove unnecessary key "data" in exports from TestLab DB

Dear @johanneshanek , can you please remove the unnecessary `"data":[{` and `}]` in the JSON exports of LambdaWork and send me an example? Please see [3291881](https://github.com/building-envelope-data/api/commit/32918819f344a819aafdff9629d525fac208ad39) for the details. Thanks and best regards