### 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
if (shader.is_valid()) {
		_reload_shader_from_disk();
	} else if (shader_inc.is_valid()) {
		_reload_shader_include_from_disk();
	}
}
void TextShaderEditor::edit(const Ref<Shader> &p_shader) {
	if (p_shader.is_null() || !p_shader->is_text_shader()) {
		return;
	}
	if (shader == p_shader) {
		return;
	}
	shader = p_shader;
	shader_inc = Ref<ShaderInclude>();
	shader_editor->set_edited_shader(shader);
}
void TextShaderEditor::edit(const Ref<ShaderInclude> &p_shader_inc) {
	if (p_shader_inc.is_null()) {
		return;
	}
	if (shader_inc == p_shader_inc) {
		return;
	}
	shader_inc = p_shader_inc;
	shader = Ref<Shader>();
	shader_editor->set_edited_shader_include(p_shader_inc);
}
void TextShaderEditor::save_external_data(const String &p_str) {