mod_adhoc_oauth2_client: Fix including final client_id in result form The client_id is composed of the details needed for retrieving the data, making it redundant to include in the data, albeit somewhat convenient sometimes. Decided to remove it anyways, but forgot to change the result.

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summary: Storage benchmark tool
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To benchmark `mod_storage_internal`:

    prosodyctl mod_benchmark_storage internal

Does a number (aprox. 10000) of reads and writes and to the selected
storage driver and tells you how long it took.