test: fix block reward check in `check_block_info_rewards`

[obycode]

Fixes integration test tests::nakamoto_integrations::check_block_info_rewards.

[wileyj]

related issue https://github.com/stacks-network/stacks-core/issues/4887

[wileyj]

expected, but this change does allow the test to pass:

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 151 filtered out; finished in 1186.00s

[blockstack-devops]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.