regression: load less tweets in feed to avoid rate limiting

lib/group/_feed.dart

@@ -166,7 +166,7 @@ class _SubscriptionGroupFeedState extends State<SubscriptionGroupFeed> {
           // Perform our search for the next page of results for this chunk, and add those tweets to our collection
           var query = _buildSearchQuery(chunk.users);
           TweetStatus result =
-              await Twitter.searchTweets(query, widget.includeReplies, limit: 20, cursor: searchCursor);
+              await Twitter.searchTweets(query, widget.includeReplies, limit: 10, cursor: searchCursor);
 
           if (result.chains.isNotEmpty) {
             tweets.addAll(result.chains);