tests: fix 'if False' statements flagged by check-code
The check-code test in the upstream mercurial repository was recently updated
to start complaining about "if False" statements. Two locations in fb-hgext
had this issue.
These both look to be copy-and-pastes of the same function, unfortunately.
That should probably be cleaned up too, but I'll leave that for a separate diff
Test Plan: Confirmed the test-check-code test passes now.
Reviewers: #fbhgext, durham, quark
Reviewed By: #fbhgext, quark
Differential Revision: https://phab.mercurial-scm.org/D71