[ios] Add thegreenfrog@ as //ios/chrome/browser/ui/badges owner

Adds sczs@ as secondary owner as well.

Bug: 976901
Change-Id: Idf814b98addffd4b543cd9166d24faf2eae06a26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1748078Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686143}

ios/chrome/browser/ui/badges/OWNERS

+thegreenfrog@chromium.org
+sczs@chromium.org
+
+# TEAM: ios-directory-owners@chromium.org
+# OS: iOS
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