menu: fix delete target

This is due to a subtle change in behavior of our duck
_scroll_controller, but it's a good one so we'll keep it.

python_payload/st3m/main_menu.py

@@ -251,10 +251,10 @@ class ApplicationMenu(RestoreMenu):
         self.tags = []
 
     def _pop_target_item(self):
-        self._scroll_controller.set_item_count(len(self._items) - 1)
         pos = self._scroll_controller.target_position()
         self._items.pop(pos)
         self._scroll_controller.set_position(pos - 1)
+        self._scroll_controller.set_item_count(len(self._items))
 
     def _sort(self):
         def sort_key(item):