fix posts/bubble banner not disappearing

closes sk22#833

mastodon/src/main/java/org/joinmastodon/android/fragments/NotificationsListFragment.java

@@ -134,6 +134,7 @@ public class NotificationsListFragment extends BaseStatusListFragment<Notificati
 							return;
 						maxID=result.maxID;
 						onDataLoaded(result.items.stream().filter(n->n.type!=null).collect(Collectors.toList()), !result.items.isEmpty());
+						bannerHelper.onBannerBecameVisible();
 						reloadingFromCache=false;
 						if (getParentFragment() instanceof NotificationsFragment nf) {
 							nf.updateMarkAllReadButton();

mastodon/src/main/java/org/joinmastodon/android/fragments/discover/BubbleTimelineFragment.java

@@ -45,6 +45,7 @@ public class BubbleTimelineFragment extends StatusListFragment {
                         if (getActivity() == null) return;
                         result=result.stream().filter(new StatusFilterPredicate(accountID, getFilterContext())).collect(Collectors.toList());
                         onDataLoaded(result, !result.isEmpty());
+						bannerHelper.onBannerBecameVisible();
                     }
                 })
                 .exec(accountID);