Fix React link
Fix React link

Test plan:
Diff test page loads again.

Auditors:
alpert

sachgits/perseus,alexristich/perseus,abe4mvp/perseus,huangins/perseus,junyiacademy/perseus,ariabuckles/perseus,ariabuckles/perseus,sachgits/perseus,iamchenxin/perseus,ariabuckles/perseus,iamchenxin/perseus,chirilo/perseus,alexristich/perseus,huangins/perseus,ariabuckles/perseus,daukantas/perseus,abe4mvp/perseus,learningequality/perseus,chirilo/perseus,junyiacademy/perseus,learningequality/perseus,daukantas/perseus