### Godot version

v4.1.1.stable.official [bd6af8e0e]

### System information

Godot v4.1.1.stable - Debian GNU/Linux trixie/sid trixie - Vulkan (Compatibility) - Mesa Intel(R) HD Graphics 520 (SKL GT2) () - Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz (4 Threads)

### Issue description

After right clicking in thet "Filter Nodes" menu in the scene tree dock, the sub-menu is populated with a "Search" icon.

If I later switch themes in the same session, this icon is never updated to match the new theme.

![image](https://github.com/godotengine/godot/assets/660911/14336bb3-12ca-48c8-b030-8ada6ac27ec6)


### Steps to reproduce

1. Right click in the "Filter Nodes" menu in scene tree dock
2. Switch themes
3. Right click again in the "Filter Nodes" menu

Expected result: Icon has updated to match the theme I am currently using
Actual result: Icon is still using the theme I launched Godot with

### Minimal reproduction project

N/A
List<Node *> selection = editor_selection->get_selected_node_list();
	for (Node *E : selection) {
		if (E != edited_scene && E->get_owner() != edited_scene) {
			accept->set_text(TTR("Can't operate on nodes from a foreign scene!"));
			accept->popup_centered();
			return false;
		}
		
		
		
		if (edited_scene->get_scene_inherited_state().is_valid() && edited_scene == E) {
			continue;
		}
		if (edited_scene->get_scene_inherited_state().is_valid() && edited_scene->get_scene_inherited_state()->find_node_by_path(edited_scene->get_path_to(E)) >= 0) {
			accept->set_text(TTR("Can't operate on nodes the current scene inherits from!"));
			accept->popup_centered();
			return false;
		}
	}
	return true;
}
bool SceneTreeDock::_validate_no_instance() {