Update OWNERS to point to platform/gestures

This repository is mostly used with the gestures library, so it makes
sense to give it the same owners.

BUG=None
TEST=None

Change-Id: Ie127cd356a8069754ed99bdd793de8d41882b5f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mttools/+/3926061
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Sean O'Brien <seobrien@chromium.org>
Tested-by: Harry Cutts <hcutts@chromium.org>
Auto-Submit: Harry Cutts <hcutts@chromium.org>
1 file changed