WifiUi: add hide Scroller event (#37248)

* add show/hide scroller events

* another good catch

selfdrive/ui/mici/layouts/settings/network/wifi_ui.py

@@ -362,6 +362,10 @@ class WifiUIMici(BigMultiOptionDialog):
     self._scroller._items.clear()
     self._update_buttons()
 
+  def hide_event(self):
+    super().hide_event()
+    self._scroller.hide_event()
+
   def _open_network_manage_page(self, result=None):
     if self._network_info_page._network is not None and self._network_info_page._network.ssid in self._networks:
       self._network_info_page.update_networks(self._networks)