Only very recently in #700 did we actually start running wasi tests
again (they weren't running by accident). Just before that landed we
also landed #688 which had some refactorings. Unfortunately #688 had a
minor issue in it which wasn't caught because tests weren't run. This
means that the bug in #688 slipped in and is now being caught by #700
now that both are landed on master.
This commit fixes the small issue introduced and should get our CI green
again!
054b79427e