fix: Always return sorted index array to make sure a json array is the result #4493
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This has been lost in https://github.com/nextcloud/deck/pull/4452/files#diff-4975b048acd756b9fe8e6d63b016021d70ade5c1f79a5797ebe4dc6f2e87d34fL182 but the place was not that obvious. We need to use the array_values of the array_unique result to make sure that indexes are still properly in line and the later conversion to JSON results in an array not an object.