### 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
shader_editor->trim_trailing_whitespace();
}
void TextShaderEditor::validate_script() {
	shader_editor->_validate_script();
}
bool TextShaderEditor::is_unsaved() const {