Move collection view cleanup to didMoveToWindow for earlier teardown

The removeFromSuperview in deinit fires too late — the ListView may still
be retained while KIF traverses the view hierarchy during test teardown.
Moving cleanup to didMoveToWindow(nil) detaches the collection view as
soon as the ListView leaves the window, preventing UICollectionViewData
from accessing a corrupted weak reference during layout.

Author: RoyalPineapple

ListableUI/Sources/ListView/ListView.swift

@@ -1113,9 +1113,13 @@ public final class ListView : UIView
     public override func didMoveToWindow()
     {
         super.didMoveToWindow()
-        
+
         if self.window != nil {
             self.updateScrollViewInsets()
+        } else {
+            self.collectionView.delegate = nil
+            self.collectionView.dataSource = nil
+            self.collectionView.removeFromSuperview()
         }
     }