remove duplication with entry_points

[kirillrdy]

installing awebcli using https://github.com/pypa/installer fails due to eb being listed in both scripts and entry_points

error: builder for '/nix/store/swk28rqdv15g8v383al28kzjvigdp4y8-awsebcli-3.20.7.drv' failed with exit code 1;
       last 10 log lines:
       >     _main(sys.argv[1:], "python -m installer")
       >   File "/nix/store/qg1mq5b71pbhnvpa8l1024prdymn2hkc-python3.10-installer-0.7.0/lib/python3.10/site-packages/installer/__main__.py", line 94, in _main
       >     installer.install(source, destination, {})
       >   File "/nix/store/qg1mq5b71pbhnvpa8l1024prdymn2hkc-python3.10-installer-0.7.0/lib/python3.10/site-packages/installer/_core.py", line 109, in install
       >     record = destination.write_file(
       >   File "/nix/store/qg1mq5b71pbhnvpa8l1024prdymn2hkc-python3.10-installer-0.7.0/lib/python3.10/site-packages/installer/destinations.py", line 203, in write_file
       >     return self.write_to_fs(
       >   File "/nix/store/qg1mq5b71pbhnvpa8l1024prdymn2hkc-python3.10-installer-0.7.0/lib/python3.10/site-packages/installer/destinations.py", line 167, in write_to_fs
       >     raise FileExistsError(message)
       > FileExistsError: File already exists: /nix/store/jr3mlipbs9s578brpwmbcppbbvd52hzd-awsebcli-3.20.7/bin/eb

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[groodt]

We're also running into this. The scripts directive is very old and unnecessary when you have console_scripts.