Fix typo in aggregatable_debug_reports_limits.json

Change-Id: Ib97beab5ec7f237d37947f5b791f174ee66ec939
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5617654


Auto-Submit: Nan Lin <linnan@chromium.org>
Commit-Queue: Andrew Paseltiner <apaseltiner@chromium.org>
Commit-Queue: Nan Lin <linnan@chromium.org>
Reviewed-by: Andrew Paseltiner <apaseltiner@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313070}