Remove duplicate subparser

[mferrera]

In Python 3.11 adding the same subparser twice will raise an exception.

Traceback (most recent call last):
  File "/../res2df/bin/res2csv", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/../res2df/res2df/res2csv.py", line 311, in main
    parser = get_parser()
             ^^^^^^^^^^^^
  File "/../res2df/res2df/res2csv.py", line 179, in get_parser
    subparsers_dict["fipreports"] = subparsers.add_parser(
                                    ^^^^^^^^^^^^^^^^^^^^^^
  File "/../lib/python3.11/argparse.py", line 1192, in add_parser
    raise ArgumentError(self, _('conflicting subparser: %s') % name)
argparse.ArgumentError: argument subcommand: conflicting subparser: fipreports

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bb7a6db) 95.18% compared to head (05092f2) 95.17%.

❗ Current head 05092f2 differs from pull request most recent head 467d316. Consider uploading reports for the commit 467d316 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #471      +/-   ##
==========================================
- Coverage   95.18%   95.17%   -0.01%     
==========================================
  Files          33       33              
  Lines        4461     4460       -1     
==========================================
- Hits         4246     4245       -1     
  Misses        215      215              

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