[pinpoint] Add dtu@chromium.org to dashboard OWNERS.
[pinpoint] Add baa605d781958521249fdcf7bad76b01d943134a@chromium.org to dashboard OWNERS.

Follow-up from https://chromium-review.googlesource.com/1081152

Change-Id: If9b03bfdec39d2ed83fba3a121503b0b016e3b32
Reviewed-on: https://chromium-review.googlesource.com/1082917
Reviewed-by: Annie Sullivan <259f984aa3b2892f452a20facda15d22b94ee4f8@chromium.org>
Commit-Queue: David Tu <baa605d781958521249fdcf7bad76b01d943134a@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult