Fix nits in bip65-cltv-p2p.py
Fix nits in bip65-cltv-p2p.py

Summary: As per title

Test Plan:
  ./test/functional/test_runner.py bip65-cltv-p2p

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D2119

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