Fix owner email typo in tools/gn/bootstrap/OWNERS

R=thakis@chromium.org

Change-Id: I60faf240e3335bba2a4258c1677b07fb892e9b69
Reviewed-on: https://chromium-review.googlesource.com/c/1407075Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#622026}

tools/gn/bootstrap/OWNERS

-thakis@chormium.org
+thakis@chromium.org
 thomasanderson@chromium.org