Add danan to supervised_user OWNERSes

Bug: None
Change-Id: I09cf3cf2c5137d39616f2c42480a8df700385db8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1956238
Auto-Submit: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Dan S <danan@chromium.org>
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726080}

chrome/browser/supervised_user/OWNERS

 agawronska@chromium.org
-# escordeiro@chromium.org
+danan@chromium.org
 hgrandinetti@chromium.org
 michaelpg@chromium.org