### 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_null() && shader_inc.is_null()) {
		disk_changed->hide();
		return;
	}
	if (trim_trailing_whitespace_on_save) {
		trim_trailing_whitespace();
	}
	apply_shaders();
	Ref<Shader> edited_shader = shader_editor->get_edited_shader();
	if (edited_shader.is_valid()) {
		ResourceSaver::save(edited_shader);
	}
	if (shader.is_valid() && shader != edited_shader) {
		ResourceSaver::save(shader);
	}
	Ref<ShaderInclude> edited_shader_inc = shader_editor->get_edited_shader_include();
	if (edited_shader_inc.is_valid()) {
		ResourceSaver::save(edited_shader_inc);
	}
	if (shader_inc.is_valid() && shader_inc != edited_shader_inc) {
		ResourceSaver::save(shader_inc);
	}
	shader_editor->get_text_editor()->tag_saved_version();
	disk_changed->hide();
}
void TextShaderEditor::trim_trailing_whitespace() {