autocomplete test [nfc]: s/streams/topics in a topic test name

Author: sm-sayedi

test/model/autocomplete_test.dart

@@ -1258,7 +1258,7 @@ void main() {
       .topic.equals(third.name);
   });
 
-  test('TopicAutocompleteView updates results when streams are loaded', () async {
+  test('TopicAutocompleteView updates results when topics are loaded', () async {
     final store = eg.store();
     final connection = store.connection as FakeApiConnection;
     connection.prepare(json: GetStreamTopicsResult(