fix chronik bridgeprimitives_tests
Summary:
D14312 broke this test
The coinbase transaction size went down from 108 bytes to 106 bytes for 200 blocks.
Test Plan:
cmake .. -GNinja -DBUILD_BITCOIN_CHRONIK=ON ninja all check-all
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D14313