Fix `npm run test` script
Fix `npm run test` script

Change-Id: Id8917176d1d9f4c0f7245504beefba2d15988a0f
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/1883710
Auto-Submit: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Commit-Queue: Yang Guo <1cf0af8245a3a17a632a2c73531392b0f9761c76@chromium.org>
Reviewed-by: Yang Guo <1cf0af8245a3a17a632a2c73531392b0f9761c76@chromium.org>

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