Fix code_search_net keys
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Fix #2552.
2021-09-02T08:24:05Z
https://github.com/huggingface/datasets/pull/2555#issuecomment-911374401
https://api.github.com/repos/huggingface/datasets/issues/2555
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2021-09-02T08:24:05Z
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There were duplicate keys in the `code_search_net` dataset, as reported in https://github.com/huggingface/datasets/issues/2552

I fixed the keys (it was an addition of the file and row indices, which was causing collisions)

Fix #2552.