Addresses a code review comment.
Co-authored-by: Marc Durdin <marc@durdin.net>
Build-bot: skip Test-bot: skip
Note: build.sh updated to make sure that test:help build action:target doesn't also call test.sh by adding `:_all` meta-target. Note: CI will need a new help-keyman-com.sh build step to deploy web engine help. Fixes: #12347