Apply requested change

Author: khanak0509

assets/l10n/app_en.arb

@@ -1424,4 +1424,4 @@
   "@topicListEmptyPlaceholderHeader": {
     "description": "Header text shown when a channel has no topics."
   }
-}
+}

lib/widgets/topic_list.dart

@@ -172,10 +172,9 @@ class _TopicListState extends State<_TopicList> with PerAccountStoreAwareStateMi
     if (lastFetchedTopics!.isEmpty) {
       final zulipLocalizations = ZulipLocalizations.of(context);
       return PageBodyEmptyContentPlaceholder(
-        header: zulipLocalizations.topicListEmptyPlaceholderHeader
-        );
+        header: zulipLocalizations.topicListEmptyPlaceholderHeader);
     }
-
+    
     // This is adapted from parts of the build method on [_InboxPageState].
     final topicItems = <_TopicItemData>[];
     for (final GetStreamTopicsEntry(:maxId, name: topic) in lastFetchedTopics!) {