Fix unnecessary loadMore calls when the end of a timeline has been reached (#9581)

Fixes #9568

app/javascript/mastodon/components/scrollable_list.js

@@ -49,7 +49,7 @@ export default class ScrollableList extends PureComponent {
       const { scrollTop, scrollHeight, clientHeight } = this.node;
       const offset = scrollHeight - scrollTop - clientHeight;
 
-      if (400 > offset && this.props.onLoadMore && !this.props.isLoading) {
+      if (400 > offset && this.props.onLoadMore && this.props.hasMore && !this.props.isLoading) {
         this.props.onLoadMore();
       }