Make myself an owner of trigger scripts.

Bug is simply an example of something that we are fixing
in trigger scripts codebase.

Bug: 1027147

Change-Id: Idfc990f9557ed618695dd6ea7b5fcc707ac33fe2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1931141
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Auto-Submit: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718339}

testing/trigger_scripts/OWNERS

+crouleau@chromium.org
 eyaich@chromium.org
 jbudorick@chromium.org
 kbr@chromium.org
-martiniss@chromium.org
 maruel@chromium.org