tests: Fix update-manpages test.
tests: Fix update-manpages test.

Change-Id: I58d85e06edeb9208a782957acc982e996c026ed2
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/351854
Reviewed-by: Sam Saccone <1dc92ef42dd4a9b5cf1cf135ebbd3434b0189447@google.com>
Tested-by: LaMont Jones <01939f9990a33aa2509cfaed21d2f9ba201a2b37@google.com>

GerritCodeReview/git-repo,GerritCodeReview/git-repo