test: Default blockversion to 4 in feature_block
test: Default blockversion to 4 in feature_block

Summary:
There is one tests that checks version=1 blocks are rejected. For all other tests the version doesn't matter as long as it is large enough.

This is a backport of [[https://github.com/bitcoin/bitcoin/pull/20167 | core#20167]] [2/3]
https://github.com/bitcoin/bitcoin/pull/20167/commits/fa7fb0e44241982a6e5cd560c06ac0c9d8f47f88

Test Plan: `test/functional/test_runner.py feature_block`

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10678

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