### 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
set_edited_shader_include(p_shader_inc, p_shader_inc->get_code());
}
void ShaderTextEditor::_shader_changed() {
	
	if (block_shader_changed) {
		return;
	}
	dependencies_version++;
	_validate_script();
}
void ShaderTextEditor::set_edited_shader_include(const Ref<ShaderInclude> &p_shader_inc, const String &p_code) {
	if (shader_inc == p_shader_inc) {
		return;
	}
	if (shader_inc.is_valid()) {
		shader_inc->disconnect(SNAME("changed"), callable_mp(this, &ShaderTextEditor::_shader_changed));
	}
	shader_inc = p_shader_inc;
	shader = Ref<Shader>();
	set_edited_code(p_code);
	if (shader_inc.is_valid()) {
		shader_inc->connect(SNAME("changed"), callable_mp(this, &ShaderTextEditor::_shader_changed));
	}
}
void ShaderTextEditor::set_edited_code(const String &p_code) {