Update services/data_decoder/OWNERS.

jcivelli is no longer working on Chromium, and we need more OWNERS for this
security-relevant service.

Bug: None
TBR: jcivelli, rsesek
Change-Id: I77f0ee0eafb4eb3b4709d18dd4ab09d9ecb7a037
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1645240
Commit-Queue: Chris Palmer <palmer@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666474}

services/data_decoder/OWNERS

-
-jcivelli@chromium.org
+palmer@chromium.org
 rsesek@chromium.org