Transfer ownership of omnibox-ui-show-suggestion-favicons to ender

This is part of the flags experiment cleanup. We need this flag for a little longer.

Bug: 951392
Change-Id: I97b381c6d8eeb4ce6581b4d142c4f437447deaea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762530
Commit-Queue: Ender <ender@google.com>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688735}

chrome/browser/flag-metadata.json

@@ -2620,8 +2620,8 @@
   },
   {
     "name": "omnibox-ui-show-suggestion-favicons",
-    "owners": [ "tommycli", "chrome-omnibox-team@google.com" ],
-    "expiry_milestone": 76
+    "owners": [ "ender", "chrome-omnibox-team@google.com" ],
+    "expiry_milestone": 79
   },
   {
     "name": "omnibox-ui-swap-title-and-url",