Pamhyr: Close sub windows at model close.

src/View/MainWindow.py

@@ -371,6 +371,8 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
         self.conf.set_close_correctly()
         self.set_title()
 
+        self._close_sub_window()
+
     def update_enable_action(self):
         """Update status of action componante