remove allenvic@ from smb_client owners

Bug: None
Change-Id: Ibaa0d86ef700576a96d8b5a40e04c8cb4fb8b850
Reviewed-on: https://chromium-review.googlesource.com/1181769Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584554}

chrome/browser/chromeos/smb_client/OWNERS

-allenvic@chromium.org
 baileyberro@chromium.org
 zentaro@chromium.org