[iOS] Replacing bzanotti by jlebel ios/chrome/browser/ui/first_run/OWNER

Replacing bzanotti by jlebel ios/chrome/browser/ui/first_run/OWNER,
since bzanotti doesn't work on Chrome anymore.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I5defa6613f4e49dfd5a94a06539f44bf8a4ad379
Reviewed-on: https://chromium-review.googlesource.com/c/1288541Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601084}

ios/chrome/browser/ui/first_run/OWNERS

-bzanotti@chromium.org
+jlebel@chromium.org
 kkhorimoto@chromium.org
 
 # TEAM: ios-directory-owners@chromium.org