Add ricea@ to modules/encoding OWNERS

NOTRY=true

Change-Id: I35b58d906385e8785e2ff6ecc2b75a9a52cc4eab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1580319Reviewed-by: Adam Rice <ricea@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Auto-Submit: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653665}

third_party/blink/renderer/modules/encoding/OWNERS

 jsbell@chromium.org
+ricea@chromium.org
 kbr@chromium.org
 
 # COMPONENT: Blink>TextEncoding