Fix ToastableViewController automatic scroll view detection not handling collection views

Tusker/Screens/Explore/TrendingStatusesViewController.swift

@@ -85,14 +85,14 @@ class TrendingStatusesViewController: UIViewController {
     override func viewWillAppear(_ animated: Bool) {
         super.viewWillAppear(animated)
         
+        if !loaded {
+            loaded = true
             var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
             snapshot.appendSections([.statuses])
             snapshot.appendItems([.loadingIndicator])
             dataSource.apply(snapshot, animatingDifferences: false)
             
             Task {
-            if !loaded {
-                loaded = true
                 await loadTrendingStatuses()
             }
         }

Tusker/Views/Toast/ToastableViewController.swift

@@ -35,7 +35,15 @@ extension ToastableViewController {
     }
     
     var toastParentView: UIView { view }
-    var toastScrollView: UIScrollView? { view as? UIScrollView }
+    var toastScrollView: UIScrollView? {
+        if let scrollView = view as? UIScrollView {
+            return scrollView
+        } else if let collectionVC = self as? CollectionViewController {
+            return collectionVC.collectionView
+        } else {
+            return nil
+        }
+    }
     
     func showToast(configuration config: ToastConfiguration, animated: Bool) {
         currentToast?.dismissToast(animated: false)