### 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
return shader_editor->get_text_editor()->get_saved_version() != shader_editor->get_text_editor()->get_version();
}
void TextShaderEditor::tag_saved_version() {
	shader_editor->get_text_editor()->tag_saved_version();
}
void TextShaderEditor::apply_shaders() {
	String editor_code = shader_editor->get_text_editor()->get_text();
	if (shader.is_valid()) {
		String shader_code = shader->get_code();
		if (shader_code != editor_code || dependencies_version != shader_editor->get_dependencies_version()) {
			shader_editor->set_block_shader_changed(true);
			shader->set_code(editor_code);
			shader_editor->set_block_shader_changed(false);
			shader->set_edited(true);
		}
	}
	if (shader_inc.is_valid()) {
		String shader_inc_code = shader_inc->get_code();
		if (shader_inc_code != editor_code || dependencies_version != shader_editor->get_dependencies_version()) {
			shader_editor->set_block_shader_changed(true);
			shader_inc->set_code(editor_code);
			shader_editor->set_block_shader_changed(false);
			shader_inc->set_edited(true);
		}
	}
	dependencies_version = shader_editor->get_dependencies_version();
}
void TextShaderEditor::_text_edit_gui_input(const Ref<InputEvent> &ev) {