nits in lcg_tests
nits in lcg_tests

Summary:
- Right now in `test_bitcoin --list_content`, it stands out due to not
  being nested in a test suite. Fix this.
- Comment typo.

Test Plan: `make check`

Reviewers: #bitcoin_abc, deadalnix, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D2896

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