[avalanche] Cleanup unnecessary timeout values in block voting test

Summary:
Setting the timeouts here are not necessary and copy-paste is causing them to
creap. Remove all of them. Shorter timeouts when debugging can be achieved
using --timeout-factor.

Test Plan:

./test/functional/test_runner.py abc_p2p_avalanche_voting

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D12896