fixed map file input output

[kamilos2354]

No description provided.

[gynt]

Which command were you exactly running that produced the original issue/error?

How was it fixed?

[kamilos2354]

I use command like python -m sourcehold map file --in map1.map --out open_map --unpack and it gave me error
Replaced args.input with getattr(args, 'in') and args.output with args.out to match the actual argument names defined by the parser and avoid attribute errors.