### 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_scene_file_path().is_empty()) {
			accept->set_text(TTR("This operation can't be done on instantiated scenes."));
			accept->popup_centered();
			return false;
		}
	}
	return true;
}
void SceneTreeDock::_node_reparent(NodePath p_path, bool p_keep_global_xform) {
	Node *new_parent = scene_root->get_node(p_path);
	ERR_FAIL_COND(!new_parent);
	List<Node *> selection = editor_selection->get_selected_node_list();
	if (selection.is_empty()) {
		return; 
	}
	Vector<Node *> nodes;
	for (Node *E : selection) {
		nodes.push_back(E);
	}
	_do_reparent(new_parent, -1, nodes, p_keep_global_xform);
}
void SceneTreeDock::_do_reparent(Node *p_new_parent, int p_position_in_parent, Vector<Node *> p_nodes, bool p_keep_global_xform) {