macosx: Mark parent scroll view in collection view supplementary detail view property as weak

This is held by a parent view in use

Signed-off-by: Claudio Cambra <developer@claudiocambra.com>

modules/gui/macosx/library/VLCLibraryCollectionViewSupplementaryDetailView.h

@@ -34,8 +34,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (readwrite, retain, nonatomic) VLCLibraryRepresentedItem *representedItem;
 
-@property (readwrite, assign) NSCollectionViewItem *selectedItem;
-@property (readwrite, assign) NSScrollView *parentScrollView;
+@property (readwrite) NSCollectionViewItem *selectedItem;
+@property (readwrite, weak) NSScrollView *parentScrollView;
 
 @property (readwrite, assign, nonatomic) NSCollectionViewScrollDirection layoutScrollDirection;
 @property (readwrite, weak) IBOutlet NSLayoutConstraint *contentViewTopConstraint;