Fix list timeline refresh failing if initial load returned no statuses

Tusker/Screens/Timeline/TimelineViewController.swift

@@ -726,10 +726,11 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
     
     @objc func refresh() {
         Task { @MainActor in
-            if case .notLoadedInitial = controller.state {
-                await controller.loadInitial()
-            } else {
+            if case .idle = controller.state,
+               !dataSource.snapshot().itemIdentifiers(inSection: .statuses).isEmpty {
                 await controller.loadNewer()
+            } else {
+                await controller.loadInitial()
             }
             #if !targetEnvironment(macCatalyst)
             collectionView.refreshControl?.endRefreshing()