### 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
if (!profile_allow_script_editing) {
		button_create_script->hide();
		button_detach_script->hide();
	} else if (editor_selection->get_selection().size() == 0) {
		button_create_script->hide();
		button_detach_script->hide();
	} else if (editor_selection->get_selection().size() == 1) {
		Node *n = editor_selection->get_selected_node_list()[0];
		if (n->get_script().is_null()) {
			button_create_script->show();
			button_detach_script->hide();
		} else {
			button_create_script->hide();
			button_detach_script->show();
		}
	} else {
		button_create_script->hide();
		Array selection = editor_selection->get_selected_nodes();
		for (int i = 0; i < selection.size(); i++) {
			Node *n = Object::cast_to<Node>(selection[i]);
			if (!n->get_script().is_null()) {
				button_detach_script->show();
				return;
			}
		}
		button_detach_script->hide();
	}
}
void SceneTreeDock::_selection_changed() {