### 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
disabled_branch_regions.clear();
	clear_highlighting_cache();
}
void GDShaderSyntaxHighlighter::set_disabled_branch_color(const Color &p_color) {
	disabled_branch_color = p_color;
	clear_highlighting_cache();
}
static bool saved_warnings_enabled = false;
static bool saved_treat_warning_as_errors = false;
static HashMap<ShaderWarning::Code, bool> saved_warnings;
static uint32_t saved_warning_flags = 0U;
void ShaderTextEditor::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_THEME_CHANGED: {
			if (is_visible_in_tree()) {
				_load_theme_settings();
				if (warnings.size() > 0 && last_compile_result == OK) {
					warnings_panel->clear();
					_update_warning_panel();
				}
			}
		} break;
	}
}
Ref<Shader> ShaderTextEditor::get_edited_shader() const {