HaikuDepot: Inherit from BWindow last so it is destroyed before everything else.

This eliminates the need for the early deletion of certain controls.

Part of #17579.

src/apps/haikudepot/ui/MainWindow.cpp

@@ -293,12 +293,8 @@ MainWindow::~MainWindow()
 			fShuttingDownWindow->Quit();
 	}
 
-	// We must clear and delete these early to release references.
+	// We must clear the model early to release references.
 	fModel.Clear();
-	fFeaturedPackagesView->RemoveSelf();
-	fPackageListView->RemoveSelf();
-	delete fFeaturedPackagesView;
-	delete fPackageListView;
 }
 
 

src/apps/haikudepot/ui/MainWindow.h

@@ -35,9 +35,9 @@ class ShuttingDownWindow;
 class WorkStatusView;
 
 
-class MainWindow : public BWindow, private PackageInfoListener,
+class MainWindow : private PackageInfoListener,
 	private ProcessCoordinatorConsumer, public ProcessCoordinatorListener,
-	public UserDetailVerifierListener {
+	public UserDetailVerifierListener, public BWindow {
 public:
 								MainWindow(const BMessage& settings);
 								MainWindow(const BMessage& settings,