[Glitch] Fix auto-loading-more when not scrolled

Port 2b98e2ecd6 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/components/scrollable_list.jsx

@@ -78,7 +78,7 @@ class ScrollableList extends PureComponent {
       const clientHeight = this.getClientHeight();
       const offset = scrollHeight - scrollTop - clientHeight;
 
-      if (400 > offset && this.props.onLoadMore && this.props.hasMore && !this.props.isLoading) {
+      if (scrollTop > 0 && offset < 400 && this.props.onLoadMore && this.props.hasMore && !this.props.isLoading) {
         this.props.onLoadMore();
       }