typescript: fix test
typescript: fix test

Summary:
I of course made a last-second change before running test suite.
This makes it pass again, by fixing the import lines to use ref/imports.

Reviewers: #core_team, fromberger

Reviewed By: #core_team, fromberger

Subscribers: #core_team

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1630

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