Patch for sub-directory issue in http-fetch

Hi, 

One of the scripts, http-fetch had an issue with saving the files as it
did not specify a separate sub-directory for individual targets. Daniel
Miller created an issue [1] about it. 

Link: https://github.com/nmap/nmap/pull/1100 

I patched it and submitted a PR. Also, verified the fix on my local
machine, it seemed to work fine. Although, if it still has some issues,
please let me know. I'll try to fix that as well. 

Regards, 

Aniket Pandey 

Links:
------
[1] https://github.com/nmap/nmap/issues/1099

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