Remove double entries on segment group level

[hf-krechan]

In the kohlrahbi data of the flatahb we have entries which are double.

For example

    {
      "ahb_expression": "Kann",
      "data_element": null,
      "guid": "17d56a20-a551-41c1-b2ca-c806ab8982c9",
      "index": 24,
      "name": null,
      "section_name": "Ansprechpartner",
      "segment_code": null,
      "segment_group_key": "SG3",
      "value_pool_entry": null
    },
    {
      "ahb_expression": "Kann",
      "data_element": null,
      "guid": "fba40a12-c494-4105-847a-46f7b5f01ef3",
      "index": 25,
      "name": "",
      "section_name": "Ansprechpartner",
      "segment_code": null,
      "segment_group_key": "SG3",
      "value_pool_entry": null
    },

https://github.com/Hochfrequenz/machine-readable_anwendungshandbuecher/blob/51c7d93e77fafea60c1acb3a9b2ca5fe26c51206/FV2310/UTILMD/flatahb/55001.json#L234-L255

These double lines should get removed.