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tests: use `testrepohg` in one more place in test-check-code.t

Authored by mharbison72.

Description

tests: use testrepohg in one more place in test-check-code.t

This is already used elsewhere in the test to access the current hg repo, and
avoids an error about the unknown revlog-compression-zstd when C extensions
aren't built. The only other such error is in test-check-interfaces.py, but I
don't see a way to avoid it other than to create an empty scratch repo.

Differential Revision: https://phab.mercurial-scm.org/D9364