[tracing] Fix show-tab-search-bubble trigger

I made a typo :(
https://chromium-review.googlesource.com/c/chromium/src/+/5380514

Change-Id: Ic5a22b2d1876d77455d7257bd6002227351c5a19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5415053


Reviewed-by: David Pennington <dpenning@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1282497}