### 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
Node *node = e->get();
				if (node && node->get_scene_inherited_state().is_valid()) {
					scene_tree->emit_signal(SNAME("open"), node->get_scene_inherited_state()->get_path());
				}
			}
		} break;
		case TOOL_TOGGLE_SCENE_UNIQUE_NAME: {
			
			List<Node *>::Element *first_selected = editor_selection->get_selected_node_list().front();
			if (first_selected == nullptr) {
				return;
			}
			if (first_selected->get() == EditorNode::get_singleton()->get_edited_scene()) {
				
				editor_selection->remove_node(first_selected->get());
				first_selected = editor_selection->get_selected_node_list().front();
				if (first_selected == nullptr) {
					return;
				}
			}
			bool enabling = !first_selected->get()->is_unique_name_in_owner();
			List<Node *> full_selection = editor_selection->get_full_selected_node_list();
			EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
			if (enabling) {
				Vector<Node *> new_unique_nodes;
				Vector<StringName> new_unique_names;
				Vector<StringName> cant_be_set_unique_names;
				for (Node *node : full_selection) {
					if (node->is_unique_name_in_owner()) {
						continue;