Always show add topic row in metadata

Add topic is heavily used by some teams. To avoid more clicks to add
topic we will show it always.

To reduce clutter, we will in future consider host config or
user role based showing/hiding.

Change-Id: I794c028c8f9c81b43918511fac193b702c20f147
(cherry picked from commit c46de9e7bb4dff4b0a31865f88961b0a606c2459)

polygerrit-ui/app/utils/change-metadata-util.ts

@@ -41,11 +41,11 @@ export const DisplayRules = {
     Metadata.REVIEWERS,
     Metadata.REPO_BRANCH,
     Metadata.SUBMITTED,
+    Metadata.TOPIC,
   ],
   SHOW_IF_SET: [
     Metadata.CC,
     Metadata.HASHTAGS,
-    Metadata.TOPIC,
     Metadata.UPLOADER,
     Metadata.AUTHOR,
     Metadata.COMMITTER,