gn: python3-genenetwork2: Update package definition

* gn/packages/genenetwork.scm (python3-genenetwork2):
[source]: Use github source tree to avoid build failures in `setup.py` which
used old python 2 syntax.
[propagated-inputs]: Use python-wrapper that maps `python3` command to
`python`. Remove "python" from inherited propagated input. Remove unittest2
and mock inputs since they are already defined in python3's standard library.
[arguments]: Inherit package arguments from genenetwork2 and only update
'#phases and '#python args.

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