Add dbeam@ and remove old team OWNERS

Add the new NTP team owner (dbeam@), and remove the old team (jkrcal@).

Change-Id: I56e4436091ff1e98d68a23afc61530442579e0b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1723300Reviewed-by: Dan Beam <dbeam@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682394}

components/ntp_tiles/OWNERS

-fhorschig@chromium.org
-jkrcal@chromium.org
+dbeam@chromium.org
 kristipark@chromium.org
-mastiz@chromium.org
-treib@chromium.org
 # COMPONENT: UI>Browser>ContentSuggestions>History