### Godot version

4.0.3

### System information

Win7

### Issue description

#if and #else highlighted with the color same as if and else shader statement:

![image](https://github.com/godotengine/godot/assets/28286958/c2d58151-d6d2-4305-b4da-36e76e316caf)


### Steps to reproduce

1. Create shader
2. Add #if and #else

### Minimal reproduction project

N/A
_update_warnings(false);
	shader_editor = memnew(ShaderTextEditor);
	shader_editor->connect("script_validated", callable_mp(this, &TextShaderEditor::_script_validated));
	shader_editor->set_v_size_flags(SIZE_EXPAND_FILL);
	shader_editor->add_theme_constant_override("separation", 0);
	shader_editor->set_anchors_and_offsets_preset(Control::PRESET_FULL_RECT);
	shader_editor->connect("show_warnings_panel", callable_mp(this, &TextShaderEditor::_show_warnings_panel));
	shader_editor->connect("script_changed", callable_mp(this, &TextShaderEditor::apply_shaders));
	EditorSettings::get_singleton()->connect("settings_changed", callable_mp(this, &TextShaderEditor::_editor_settings_changed));
	ProjectSettingsEditor::get_singleton()->connect("confirmed", callable_mp(this, &TextShaderEditor::_project_settings_changed));
	shader_editor->get_text_editor()->set_code_hint_draw_below(EDITOR_GET("text_editor/completion/put_callhint_tooltip_below_current_line"));
	shader_editor->get_text_editor()->set_symbol_lookup_on_click_enabled(true);
	shader_editor->get_text_editor()->set_context_menu_enabled(false);
	shader_editor->get_text_editor()->connect("gui_input", callable_mp(this, &TextShaderEditor::_text_edit_gui_input));
	shader_editor->update_editor_settings();
	context_menu = memnew(PopupMenu);
	add_child(context_menu);
	context_menu->connect("id_pressed", callable_mp(this, &TextShaderEditor::_menu_option));
	VBoxContainer *main_container = memnew(VBoxContainer);
	HBoxContainer *hbc = memnew(HBoxContainer);
	edit_menu = memnew(MenuButton);
	edit_menu->set_shortcut_context(this);
	edit_menu->set_text(TTR("Edit"));
	edit_menu->set_switch_on_hover(true);
	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("ui_undo"), EDIT_UNDO);
	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("ui_redo"), EDIT_REDO);